fixes in built-in schedulers

Update plugin org.jetbrains.dokka to v1.9.20

.github/workflows/kdocs.yml

@@ -0,0 +1,21 @@
+name: Publish KDocs
+on:
+  push:
+    branches:
+      - master
+jobs:
+  publishing:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-java@v1
+        with:
+          java-version: 17
+      - name: Build
+        run: ./gradlew dokkaHtml
+      - name: Publish KDocs
+        uses: peaceiris/actions-gh-pages@v3
+        with:
+          github_token: ${{ secrets.GITHUB_TOKEN }}
+          publish_dir: ./build/dokka/html
+          publish_branch: kdocs

.github/workflows/publishing_packages.yml

@@ -0,0 +1,27 @@
+name: Publish package to GitHub Packages
+on: [push]
+jobs:
+  publishing:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-java@v1
+        with:
+          java-version: 17
+      - name: Update version
+        run: |
+          branch="`echo "${{ github.ref }}" | grep -o "[^/]*$"`"
+          sed -i -e "s/^version=\([0-9\.]*\)/version=\1-branch_$branch-build${{ github.run_number }}/" gradle.properties
+      - name: prebuild
+        run: ./gradlew clean build
+      - name: Publish to Gitea
+        continue-on-error: true
+        run: ./gradlew publishAllPublicationsToGiteaRepository
+        env:
+          GITEA_TOKEN: ${{ secrets.GITEA_TOKEN }}
+      - name: Publish package
+        continue-on-error: true
+        run: ./gradlew --no-parallel publishAllPublicationsToGithubPackagesRepository
+        env:
+          GITHUBPACKAGES_USER: ${{ github.actor }}
+          GITHUBPACKAGES_PASSWORD: ${{ secrets.GITHUB_TOKEN }}

.gitignore

@@ -9,4 +9,6 @@ settings.xml
 build/
 out/
 
+kotlin-js-store/
+
 local.properties

.travis.yml

@@ -1,10 +0,0 @@
-language: java
-install: true
-
-os: linux
-dist: trusty
-jdk: oraclejdk8
-
-script:
-  - ./gradlew build allTests -s
-

CHANGELOG.md

@@ -1,5 +1,342 @@
 # Changelog
 
+## 2.2.9
+
+* `Version`:
+  * `Kotlin`: `1.9.23`
+  * `Serialization`: `1.6.3`
+  * `Klock`: `5.3.2`
+* Fixes in build-in schedulers
+
+## 2.2.8
+
+* `Version`:
+  * `Coroutines`: `1.8.0`
+
+## 2.2.7
+
+* `Version`:
+  * `Klock`: `5.3.1`
+  * `AndroidXWork`: `2.9.0`
+
+## 2.2.6
+
+**Since this version klock depdendency replaced with `com.soywiz.korge:korlibs-time`**
+
+* `Version`:
+  * `Klock`: `5.3.0`
+
+## 2.2.5
+
+* `Versions`
+  * `Kotlin`: `1.9.22`
+  * `Serialization`: `1.6.2`
+
+## 2.2.4
+
+* `Versions`
+  * `Kotlin`: `1.9.21`
+  * `Serialization`: `1.6.1`
+
+## 2.2.3
+
+**THIS UPDATE CONTAINS UPGRADE OF USED JDK UP TO 17**
+
+* Versions
+  * `Kotlin`: `1.9.20`
+
+## 2.2.2
+
+* Versions
+  * `Kotlin`: `1.9.20-RC`
+  * `Android` (min/target): `34`
+
+## 2.2.1
+
+* Potential fix of [#65](https://github.com/InsanusMokrassar/krontab/issues/65)
+* Versions
+  * `Kotlin`: `1.9.20-Beta`
+  * `Klock`: `4.0.10`
+  * `Serialization`: `1.6.0`
+
+## 2.2.0
+
+* Versions
+  * `Kotlin`: `1.9.0`
+  * `Coroutines`: `1.7.3`
+  * `Klock`: `4.0.9`
+
+## 2.1.2
+
+* Versions
+  * `Coroutines`: `1.7.2`
+* All callbacks for standard extensions like `doInfinity` now fully inline
+
+## 2.1.1
+
+* `asFlowWithoutDelays` and `asTzFlowWithoutDelays` will have nullable `since` parameters with default to `null`
+  to avoid any inconsistency of `Flow` idiom.
+  <details>
+    <summary>About the reason of changes</summary>
+    Cold flows should not contain some state by default. So, it was not right to save some `DateTime`/`DateTimeTz`
+    by default. Now it will not use some external state unless developers will set it manually
+  </details>
+
+## 2.1.0
+
+* Versions
+  * `Kotlin`: `1.8.22`
+  * `Klock`: `4.0.3`
+* New value class `KrontabConfig`. It is preferable way to create `KronScheduler` instead of
+  `KrontabTemplate` since this update
+* You may configure krontab with builders using simple `KronScheduler` invoke extension
+* New useful extensions like `KronScheduler.daily`
+* `KrontabTemplateWrapper` is obsolete in favor to `KrontabConfig`
+
+## 2.0.0
+
+* Versions
+  * `Kotlin`: `1.8.21`
+  * `Klock`: `4.0.1`
+* Support of `mingwx64` platform
+
+## 1.0.0
+
+* Versions
+  * `Kotlin`: `1.8.20`
+  * `AndroidXWork`: `2.8.1`
+
+## 0.10.0
+
+* New extensions for `KronScheduler`:
+  * `asTzFlowWithoutDelays`/`asFlowWithoutDelays`
+  * `asTzFlowWithDelays`/`asFlowWithDelays`
+* Old `KronScheduler.asFlow` and `KronScheduler.asTzFlow` temporarily marked as deprecated: after several versions their
+behaviour will be changed to undelayed one
+* All the flow extensions now use `cold` non-channel flows. Potentially it should increase performance and decrease memory usage
+
+## 0.9.0
+
+* Versions
+  * `Kotlin`: `1.8.10`
+  * `AndroidXWork`: `2.8.0`
+
+## 0.8.5
+
+* Project is now available in owner `Gitea`: https://git.inmo.dev/InsanusMokrassar/-/packages/maven/dev.inmo-krontab
+* `KronSchedulerTz#next` with incoming `DateTime` now will use adjusted local time instead of unadjusted one
+* `CronDateTimeSchedulerTz#next` with incoming `DateTime` will convert that parameter to internal offset directly
+
+## 0.8.4
+
+* Versions
+  * `Kotlin`: `1.7.22`
+
+## 0.8.3
+
+* Versions
+  * `Kotlin`: `1.7.21`
+  * `Klock`: `3.4.0`
+
+## 0.8.2
+
+**THIS VERSION HAS CHANGED COMPILE ANDROID SDK FROM 32 -> 33**
+
+* Versions
+  * `Kotlin`: `1.7.20`
+  * `Klock`: `3.2.0`
+
+## 0.8.1
+
+* Versions
+  * `Klock`: `3.1.0`
+
+## 0.8.0
+
+**THIS VERSION HAS CHANGED MIN ANDROID SDK FROM 19 -> 21**
+
+* Versions
+  * `Kotlin`: `1.7.10`
+  * `Klock`: `3.0.0`
+
+## 0.7.5
+
+* Versions
+  * `Coroutines`: `1.6.4`
+
+## 0.7.4
+
+* Versions
+  * `Coroutines`: `1.6.3`
+
+## 0.7.3
+
+* Versions
+  * `Kotlin`: `1.6.21`
+* Several bug fixes ([#27](https://github.com/InsanusMokrassar/krontab/issues/27), [#34](https://github.com/InsanusMokrassar/krontab/issues/34))
+* New factories for `KronScheduler` and `KronSchedulerTz` (fix of [#35](https://github.com/InsanusMokrassar/krontab/issues/35))
+* Fill extensions for flow with time zones (fix of [#33](https://github.com/InsanusMokrassar/krontab/issues/33))
+
+## 0.7.2
+
+* Versions
+  * `Coroutines`: `1.6.1`
+  * `Klock`: `2.7.0`
+* Deprecate `do*Local` due to their redundancy (use `do*` instead)
+* Add support of milliseconds as optional parameter after month (fix of [#31](https://github.com/InsanusMokrassar/krontab/issues/31))
+* Add support of filters for `Flow`s with `DateTime` (fix of [#30](https://github.com/InsanusMokrassar/krontab/issues/30))
+
+## 0.7.1
+
+* Versions
+  * `Klock`: `2.5.2`
+
+## 0.7.0
+
+**ALL DEPRECATIONS HAVE BEEN REMOVED**
+
+* Versions
+  * `Kotlin`: `1.6.10`
+  * `Klock`: `2.4.10`
+  * `Coroutines`: `1.6.0`
+  * `Androidx Work`: `2.7.1`
+
+## 0.6.6
+
+* Versions
+  * `Klock`: `2.4.8`
+  * `Androidx Work`: `2.7.0`
+
+## 0.6.5
+
+* Flows now use `doWhile` functions
+* `doWhile` now use additional delay (for 1 ms) for cases when `block` executing too fast
+* New extensions for `KronScheduler`: `do(Once/While/Infinity)Local`/`do(Once/While/Infinity)Tz`
+
+## 0.6.4
+
+* Versions
+  * `Kotlin`: `1.5.31`
+  * `Coroutines`: `1.5.2`
+  * `Klock`: `2.4.2`
+  * `Androidx Work`: `2.6.0`
+
+## 0.6.3
+
+* Versions
+  * `Kotlin`: `1.5.30`
+  * `Klock`: `2.4.0`
+
+## 0.6.2
+
+**LEGACY COMPILER VARIANT FOR JS IS NOT AVAILABLE SINCE THIS UPDATE**
+
+* Versions
+  * `Kotlin`: `1.5.21`
+  * `Coroutines`: `1.5.1`
+  * `Klock`: `2.3.1`
+
+## 0.6.1
+
+* Versions
+  * `Klock`: `2.1.0` -> `2.1.2`
+* Rewriting of default mechanism of `KronScheduler`s
+
+## 0.6.0
+
+* Versions
+  * `Kotlin`: `1.4.32` -> `1.5.10`
+  * `Coroutines`: `1.4.3` -> `1.5.0`
+  * `Klock`: `2.0.7` -> `2.1.0`
+
+## 0.5.2
+
+* Versions
+  * `Kotlin`: `1.4.31` -> `1.4.32`
+* Supporting of weekdays
+* Supporting of timezones
+  * Any `KronScheduler` now can be used for calling `next` with `DateTimeTz`
+  * New type `KronSchedulerTz`
+* `SchedulerFlow` has been deprecated
+* New extension `asTzFlow` and small changes in `asFlow` logic
+* `merge` extensions now return `CollectionKronScheduler` instead of just `KronScheduler`
+
+## 0.5.1
+
+* Versions
+  * `Kotlin`: `1.4.21` -> `1.4.31`
+  * `Coroutines`: `1.4.2` -> `1.4.3`
+  * `Klock`: `2.0.3` -> `2.0.7`
+  * `Androidx Work`: `2.4.0` -> `2.5.0`
+
+## 0.5.0 Years
+
+**BREAKING CHANGES**
+
+* `CronDateTimeScheduler` has been marked as `internal` and no longer accessible outside of internal functions
+  * Old methods `merge` and `plus` related to `CronDateTimeScheduler` has been marked as `deprecated` and changed their
+  parameters types - it is `KronScheduler` now
+* New methods `merge` has been added
+* **`KronScheduler#next` method now is nullable. Use `nextOrRelative`/`nextOrNow` to get next time certainly**
+* **Years was added as optional part of krontab template and opportunity in `SchedulerBuilder`**
+  * New builder `YearsBuilder`
+  * `SchedulerFlow#collectSafely` will be normally (without exceptions) finish when `next` of scheduler will return
+    null
+* `KronScheduler#doOnce` will run code immediately in case when `next` is returning null value
+* `KrontabTemplateWrapper` has been added
+* New extension `KrontabTemplate#toKronScheduler` (works as `toSchedule`)
+* **Fixed issue related to the fact that `toNearDateTime` of `CronDateTime` incorrectly handled months**
+* **Android target has been added**
+
+## 0.4.2
+
+* Versions
+  * `Kotlin`: `1.4.20` -> `1.4.21`
+  * `Klock`: `2.0.1` -> `2.0.3`
+* `CronDateTimeScheduler` now is deprecated and will be set up as `internal` in future
+
+## 0.4.1
+
+* Versions:
+  * `Coroutines`: `1.4.1` -> `1.4.2`
+  * `Klock`: `2.0.0` -> `2.0.1`
+* `CronDateTimeScheduler` now is public
+* New functions for `CronDateTimeScheduler`
+* Add `CollectionKronScheduler`. It will give opportunity to unite several schedulers in one
+
+## 0.4.0
+
+**BREAKING CHANGES**
+Package of project has been changed. Migration:
+
+* Replace in your dependencies `com.insanusmokrassar:krontab` by `dev.inmo:krontab`
+* Replace in your project all imports `com.insanusmokrassar.krontab` by `dev.inmo.krontab`
+
+* Versions:
+    * `Kotlin`: `1.4.10` -> `1.4.20`
+    * `Klock`: `1.12.1` -> `2.0.0`
+
+## 0.3.3
+
+* Versions:
+    * `Coroutines`: `1.3.9` -> `1.4.1`
+
+## 0.3.2
+
+* Function `TimeBuilder#each` was added (works as `at`)
+* Add opportunity to use `first` shortcuts:
+    * Value property `TimeBuilder#first` for including via functions like `TimeBuilder#at`
+    * Shortcut for kron string format `f` or `F`
+* Add opportunity to use `last` shortcuts:
+    * Value property `TimeBuilder#last` for including via functions like `TimeBuilder#at`
+    * Shortcut for kron string format `l` or `L`
+
+## 0.3.1
+
+* Versions:
+    * `Kotlin`: `1.4.0` -> `1.4.10`
+    * `Klock`: `1.12.0` -> `1.12.1`
+
 ## 0.3.0
 
 * Versions:
@@ -9,19 +346,6 @@
 * Typealias `KrontabTemplate` was added
 * Extension `KrontabTemplate#toSchedule` was added
 
-### 0.3.1
-
-* Versions:
-    * `Kotlin`: `1.4.0` -> `1.4.10`
-    * `Klock`: `1.12.0` -> `1.12.1`
-
-## 0.2.0
-
-* Updated way of publishing (for more info look at the [git](https://git.insanusmokrassar.com/InsanusMokrassar/krontab))
-* Updates in libraries:
-    * Coroutines `1.3.2` -> `1.3.3`
-    * Klock `1.7.3` -> `1.8.6`
-
 ### 0.2.4
 
 * Updates in libraries:
@@ -29,7 +353,7 @@
     * Coroutines `1.3.7` -> `1.3.8`
 * Ranges support were included. Now it is possible to correctly use syntax `0-5` in strings schedules
 
-### 0.2.3
+## 0.2.3
 
 * Updates in libraries:
     * Kotlin `1.3.70` -> `1.3.72`
@@ -41,13 +365,20 @@
     * `KronScheduler#doWhile` was rewritten to use `KronScheduler#doOnce` for calculations of `block` result
 * New `buildSchedule(String)` function as a shortcut for `createSimpleScheduler(String)`
 
-### 0.2.2
+## 0.2.2
 
 * Updates in libraries:
     * Kotlin `1.3.61` -> `1.3.70`
     * Coroutines `1.3.3` -> `1.3.5`
     * Klock `1.8.6` -> `1.10.0`
 
-### 0.2.1
+## 0.2.1
 
 * Added support of flows: now any `KronScheduler` can be convert to `Flow<DateTime>` using `asFlow` extension
+
+## 0.2.0
+
+* Updated way of publishing (for more info look at the [git](https://git.insanusmokrassar.com/InsanusMokrassar/krontab))
+* Updates in libraries:
+    * Coroutines `1.3.2` -> `1.3.3`
+    * Klock `1.7.3` -> `1.8.6`

README.md

@@ -1,20 +1,20 @@
 # krontab
 
- [ ![Download](https://api.bintray.com/packages/insanusmokrassar/InsanusMokrassar/krontab/images/download.svg) ](https://bintray.com/insanusmokrassar/InsanusMokrassar/krontab/_latestVersion)
+[![Maven Central](https://maven-badges.herokuapp.com/maven-central/dev.inmo/krontab/badge.svg)](https://maven-badges.herokuapp.com/maven-central/dev.inmo/krontab)
- [![Maven Central](https://maven-badges.herokuapp.com/maven-central/com.insanusmokrassar/krontab/badge.svg)](https://maven-badges.herokuapp.com/maven-central/com.insanusmokrassar/krontab)
+
- [![Build Status](https://travis-ci.com/InsanusMokrassar/krontab.svg?branch=master)](https://travis-ci.com/InsanusMokrassar/krontab)
+[![Telegram Chat](https://img.shields.io/badge/Telegram%20Chat-0288D1?style=for-the-badge&logo=telegram&logoColor=white)](https://inmodev_chat.t.me)
- 
+
+![JVM](https://img.shields.io/badge/JVM-red?style=for-the-badge&logo=openjdk&logoColor=white)
+![Android](https://img.shields.io/badge/Android-green?style=for-the-badge&logo=android&logoColor=white)
+![Js](https://img.shields.io/badge/JavaScript-323330?style=for-the-badge&logo=javascript&logoColor=F7DF1E)
+![Linux x64](https://img.shields.io/badge/Linux%20x64-white?style=for-the-badge&logo=linux&logoColor=black)
+
+[![KDocs](https://img.shields.io/badge/KDocs-323330?style=for-the-badge&logo=Kotlin&logoColor=7F52FF)](https://insanusmokrassar.github.io/krontab/)
+[![Tutorials](https://img.shields.io/badge/Tutorials-0288D1?style=for-the-badge&logo=mkdocs&logoColor=white)](https://docs.inmo.dev/krontab/index.html)
+
 Library was created to give oppotunity to launch some things from time to time according to some schedule in
 runtime of applications.
 
-| Table of content |
-|---|
-| [ How to use ](#how-to-use) |
-| [ How to use: Including in project ](#including-in-project) |
-| [ How to use: Config from string ](#config-from-string) |
-| [ How to use: Config via builder (DSL preview) ](#config-via-builder) |
-| [ How to use: KronScheduler as a Flow ](#KronScheduler-as-a-Flow) |
-
 ## How to use
 
 There are several ways to configure and use this library:
@@ -27,7 +27,7 @@ Anyway, to start some action from time to time you will need to use one of exten
 ```kotlin
 val kronScheduler = /* creating of KronScheduler instance */;
 
-kronScheuler.doWhile {
+kronScheduler.doWhile {
     // some action
     true // true - repeat on next time
 }
@@ -39,12 +39,12 @@ If you want to include `krontab` in your project, just add next line to your
 dependencies part:
 
 ```groovy
-implementation "com.insanusmokrassar:krontab:$krontab_version"
+implementation "dev.inmo:krontab:$krontab_version"
 ```
 
 Next version is the latest currently for the library:
 
-[ ![Download](https://api.bintray.com/packages/insanusmokrassar/InsanusMokrassar/krontab/images/download.svg) ](https://bintray.com/insanusmokrassar/InsanusMokrassar/krontab/_latestVersion)
+[![Maven Central](https://maven-badges.herokuapp.com/maven-central/dev.inmo/krontab/badge.svg)](https://maven-badges.herokuapp.com/maven-central/dev.inmo/krontab)
 
 For old version of Gradle, instead of `implementation` word developers must use `compile`.
 
@@ -52,19 +52,22 @@ For old version of Gradle, instead of `implementation` word developers must use
 
 Developers can use more simple way to configure repeat times is string. String configuring
 like a `crontab`, but with a little bit different meanings:
+
 ```
-/-------- Seconds
+/--------------- Seconds
-| /------ Minutes
+| /------------- Minutes
-| | /---- Hours
+| | /----------- Hours
-| | | /-- Days of months
+| | | /--------- Days of months
-| | | | / Months
+| | | | /------- Months
-| | | | |
+| | | | | /----- (optional) Year
-* * * * *
+| | | | | | /--- (optional) Timezone offset
+| | | | | | |  / (optional) Week days
+* * * * * * 0o *w
 ```
 
 It is different with original `crontab` syntax for the reason, that expected that in practice developers
-will use seconds and minutes with more probability than months (for example). In fact, developers will use something
+will use seconds and minutes with more probability than months (for example) or even years. In fact, developers will use
-like:
+something like:
 
 ```kotlin
 doWhile("/5 * * * *") {
@@ -73,7 +76,7 @@ doWhile("/5 * * * *") {
 }
 ```
 
-Or more version:
+An other version:
 
 ```kotlin
 doInfinity("/5 * * * *") {
@@ -85,7 +88,7 @@ Both of examples will print `Called` message every five seconds.
 
 ### Config via builder
 
-Also this library currently supports DSL for creating the same goals:
+Also, this library currently supports DSL for creating the same goals:
 
 ```kotlin
 val kronScheduler = buildSchedule {
@@ -128,6 +131,38 @@ kronScheduler.doInfinity {
 
 All of these examples will do the same things: print `Called` message every five seconds.
 
+### do\* functions
+
+With regular `doOnce`/`doWhile`/`doInfinity` there are two types of their variations: **local** and **timezoned**. Local
+variations (`doOnceLocal`/`doWhileLocal`/`doInfinityLocal`) will pass `DateTime` as an argument into the block:
+
+```kotlin
+doInfinityLocal("/5 * * * *") {
+    println(it) // will print current date time
+}
+```
+
+Timezoned variations (`doOnceTz`/`doWhileTz`/`doInfinityTz`) will do the same thing but pass as an argument `DateTimeTz`:
+
+```kotlin
+doInfinityTz("/5 * * * * 0o") {
+    println(it) // will print current date time in UTC
+}
+```
+
+It is useful in cases when you need to get the time of calling and avoid extra calls to system time.
+
+#### Helpful table for 
+
+|  | No args | Local `DateTime` | Local `DateTimeTz` with offset of `KronScheduler` |
+|---| ------- | ---------------- | ------------------------------------------------- |
+| **Call only near time** | doOnce | doOnceLocal | doOnceTz |
+| **Call while condition is true** | doWhile | doWhileLocal | doWhileTz |
+| **Work infinity*** | doInfinity | doInfinityLocal | doInfinityTz |
+
+*Here there is an important notice, that `Work infinity` is not exactly `infinity`. Actually, that means that `do while
+coroutine is alive` and in fact executing will be stopped when coroutine became cancelled.
+
 ### KronScheduler as a Flow
 
 Any `KronScheduler`can e converted to a `Flow<DateTime` using extension `asFlow`:
@@ -152,3 +187,27 @@ flow.takeWhile {
     action()
 }
 ```
+
+### Offsets
+
+Offsets in this library works via passing parameter ending with `o` in any place after `month` config. Currently
+there is only one format supported for offsets: minutes of offsets. To use time zones you will need to call `next`
+method with `DateTimeTz` argument or `nextTimeZoned` method with any `KronScheduler` instance, but in case if this
+scheduler is not instance of `KronSchedulerTz` it will work like you passed just `DateTime`.
+
+Besides, in case you wish to use time zones explicitly, you will need to get `KronSchedulerTz`. It is possible by:
+
+* Using `createSimpleScheduler`/`buildSchedule`/`KrontabTemplate#toSchedule`/`KrontabTemplate#toKronScheduler` methods
+with passing `defaultOffset` parameter
+* Using `SchedulerBuilder#build`/`createSimpleScheduler`/`buildSchedule`/`KrontabTemplate#toSchedule`/`KrontabTemplate#toKronScheduler`
+methods with casting to `KronSchedulerTz` in case you are pretty sure that it is timezoned `KronScheduler`
+* Creating your own implementation of `KronSchedulerTz`
+
+### Note about week days
+
+Unlike original CRON, here week days:
+
+* Works as `AND`: cron date time will search first day which will pass requirement according all parameters including
+week days
+* You may use any related to numbers syntax with week days: `0-3w`, `0,1,2,3w`, etc.
+* Week days (like years and offsets) are optional and can be placed anywhere after `month`

build.gradle

@@ -1,43 +1,67 @@
 buildscript {
     repositories {
         mavenLocal()
-        jcenter()
+        // jcenter()
         mavenCentral()
+        google()
     }
 
     dependencies {
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
-        classpath "com.jfrog.bintray.gradle:gradle-bintray-plugin:$gradle_bintray_plugin_version"
+        classpath "org.jetbrains.kotlin:kotlin-serialization:$kotlin_version"
         classpath "com.github.breadmoirai:github-release:$github_release_plugin_version"
+        classpath "com.getkeepsafe.dexcount:dexcount-gradle-plugin:$dexcount_version"
+        classpath "com.android.tools.build:gradle:$android_gradle_version"
     }
 }
 
 plugins {
     id "org.jetbrains.kotlin.multiplatform" version "$kotlin_version"
+    id "org.jetbrains.kotlin.plugin.serialization" version "$kotlin_version"
     id "org.jetbrains.dokka" version "$dokka_version"
 }
 
-project.version = "0.3.1"
+// temporal crutch until legacy tests will be stabled or legacy target will be removed
-project.group = "com.insanusmokrassar"
+allprojects {
+    if (it != rootProject.findProject("docs")) {
+        tasks.whenTaskAdded { task ->
+            if(task.name == "jsLegacyBrowserTest" || task.name == "jsLegacyNodeTest") {
+                task.enabled = false
+            }
+        }
+    }
+}
+
+apply plugin: "com.android.library"
+
+project.version = "$version"
+project.group = "dev.inmo"
 
 apply from: "publish.gradle"
 apply from: "github_release.gradle"
 
 repositories {
     mavenLocal()
-    jcenter()
+    // jcenter()
     mavenCentral()
-    maven { url "https://kotlin.bintray.com/kotlinx" }
+    // maven { url "https://kotlin.bintray.com/kotlinx" }
+    google()
 }
 
 apply from: './dokka.gradle'
 
 kotlin {
     jvm()
-    js(BOTH) {
+    js(IR) {
         browser()
         nodejs()
     }
+    android {
+        publishAllLibraryVariants()
+    }
+    linuxX64()
+    mingwX64()
+    linuxArm64()
 
 
     sourceSets {
@@ -45,18 +69,23 @@ kotlin {
             dependencies {
                 implementation kotlin('stdlib')
                 api "org.jetbrains.kotlinx:kotlinx-coroutines-core:$kotlin_coroutines_version"
+                api "org.jetbrains.kotlinx:kotlinx-serialization-core:$kotlin_serialization_version"
 
-                api "com.soywiz.korlibs.klock:klock:$klockVersion"
+                api "com.soywiz.korge:korlibs-time:$klockVersion"
             }
         }
+
+        androidMain {
+            dependencies {
+                api "androidx.work:work-runtime-ktx:$androidx_work_version"
+            }
+        }
+
         commonTest {
             dependencies {
                 implementation kotlin('test-common')
                 implementation kotlin('test-annotations-common')
-            }
+                implementation "org.jetbrains.kotlinx:kotlinx-coroutines-test:$kotlin_coroutines_version"
-        }
-        jvmMain {
-            dependencies {
             }
         }
         jvmTest {
@@ -64,10 +93,55 @@ kotlin {
                 implementation kotlin('test-junit')
             }
         }
-        jsMain {
+        jsTest {
             dependencies {
                 implementation kotlin('test-js')
             }
         }
+        androidUnitTest {
+            dependencies {
+                implementation kotlin('test-junit')
+            }
+        }
     }
 }
+
+apply plugin: 'com.getkeepsafe.dexcount'
+
+android {
+    compileSdk "$android_compileSdkVersion".toInteger()
+    buildToolsVersion = "$android_buildToolsVersion"
+    namespace "${group}.${project.name}"
+
+    defaultConfig {
+        minSdkVersion "$android_minSdkVersion".toInteger()
+        targetSdkVersion "$android_compileSdkVersion".toInteger()
+        versionCode "${android_code_version}".toInteger()
+        versionName "$version"
+    }
+    buildTypes {
+        release {
+            minifyEnabled false
+        }
+        debug {
+            debuggable true
+        }
+    }
+
+    compileOptions {
+        sourceCompatibility JavaVersion.VERSION_17
+        targetCompatibility JavaVersion.VERSION_17
+    }
+
+    sourceSets {
+        main.java.srcDirs += 'src/main/kotlin'
+        test {
+            java.srcDir file("src/jvmTest")
+        }
+    }
+}
+
+java {
+    sourceCompatibility = JavaVersion.VERSION_17
+    targetCompatibility = JavaVersion.VERSION_17
+}

dokka.gradle

@@ -1,42 +1,54 @@
-dokka {
+dokkaHtml {
-    outputFormat = 'html'
+    String dokkaOutputDirectoryPath = null
-
     switch (true) {
         case project.hasProperty("DOKKA_PATH"):
-            outputDirectory = project.property("DOKKA_PATH").toString()
+            dokkaOutputDirectoryPath = project.property("DOKKA_PATH").toString()
             break
         case System.getenv("DOKKA_PATH") != null:
-            outputDirectory = System.getenv("DOKKA_PATH")
+            dokkaOutputDirectoryPath = System.getenv("DOKKA_PATH")
             break
     }
+    if (dokkaOutputDirectoryPath != null) {
+        File outputDirectoryFile = new File(dokkaOutputDirectoryPath)
+        outputDirectoryFile.mkdirs()
+        outputDirectory = outputDirectoryFile
+    }
 
-    multiplatform {
+    moduleName.set("kdocs")
-        global {
+    
-            perPackageOption {
+    dokkaSourceSets {
-                prefix = "com.insanusmokrassar"
+        switch (true) {
-                skipDeprecated = true
+            case project.hasProperty("DOKKA_PATH"):
-                includeNonPublic = true
+                outputDirectory = new File(project.property("DOKKA_PATH").toString())
-                reportUndocumented = true
+                break
+            case System.getenv("DOKKA_PATH") != null:
+                outputDirectory = new File(System.getenv("DOKKA_PATH"))
+                break
+        }
+
+        dokkaSourceSets {
+            configureEach {
+                skipDeprecated.set(true)
+
+                sourceLink {
+                    localDirectory.set(file("./"))
+                    remoteUrl.set(new URL("https://github.com/InsanusMokrassar/krontab/blob/master/"))
+                    remoteLineSuffix.set("#L")
+                }
             }
 
-            sourceLink {
+            named("commonMain") {
-                path = "./"
+                sourceRoots.setFrom(findSourcesWithName("commonMain"))
-                url = "https://github.com/InsanusMokrassar/krontab/blob/master/"
-                lineSuffix = "#L"
             }
-        }
 
-        common {
+//
-            targets = ["JVM", "JS"]
+//            named("jsMain") {
-            sourceRoot { path = "src/commonMain" }
+//                sourceRoot { path = "src/jsMain" }
-        }
+//            }
-        js {
+//
-            targets = ["JS"]
+//            named("jvmMain") {
-            sourceRoot { path = "src/jsMain" }
+//                sourceRoot { path = "src/jvmMain" }
-        }
+//            }
-        jvm {
-            targets = ["JVM"]
-            sourceRoot { path = "src/jvmMain" }
         }
     }
 }

github_release.gradle

@@ -1,9 +1,11 @@
-private String getCurrentVersionChangelog() {
+private String getCurrentVersionChangelog(String version) {
     OutputStream changelogDataOS = new ByteArrayOutputStream()
     exec {
-        standardOutput = changelogDataOS
         commandLine 'chmod', "+x", './changelog_parser.sh'
-        commandLine './changelog_parser.sh', "$library_version", 'CHANGELOG.md'
+    }
+    exec {
+        standardOutput = changelogDataOS
+        commandLine './changelog_parser.sh', "$version", 'CHANGELOG.md'
     }
 
     return changelogDataOS.toString().trim()
@@ -16,13 +18,13 @@ if (new File(projectDir, "secret.gradle").exists()) {
     githubRelease {
         token "${project.property('GITHUB_RELEASE_TOKEN')}"
 
-        owner "InsanusMokrassar"
+        owner = "InsanusMokrassar"
-        repo "${rootProject.name}"
+        repo = "${rootProject.name}"
 
-        tagName "${project.version}"
+        tagName = "v${project.version}"
-        releaseName "${project.version}"
+        releaseName = "${project.version}"
-        targetCommitish "${project.version}"
+        targetCommitish = "${project.version}"
 
-        body getCurrentVersionChangelog()
+        body = getCurrentVersionChangelog("${project.version}")
     }
 }

gradle.properties

@@ -1,13 +1,40 @@
+org.gradle.jvmargs=-Xmx512m
 kotlin.code.style=official
-kotlin_version=1.4.10
+org.gradle.parallel=true
-kotlin_coroutines_version=1.3.9
+kotlin.js.generate.externals=true
-
+kotlin.incremental=true
-dokka_version=0.10.1
+kotlin.incremental.js=true
-
-gradle_bintray_plugin_version=1.8.5
-
-klockVersion=1.12.1
-
-github_release_plugin_version=2.2.12
-
 kotlin.incremental.multiplatform=true
+android.useAndroidX=true
+android.enableJetifier=false
+
+
+kotlin_version=1.9.23
+kotlin_coroutines_version=1.8.0
+kotlin_serialization_version=1.6.3
+
+dokka_version=1.9.20
+
+klockVersion=5.4.0
+
+## Github reease
+
+github_release_plugin_version=2.5.2
+
+## Android
+
+android_gradle_version=8.1.4
+android_minSdkVersion=21
+android_compileSdkVersion=34
+android_buildToolsVersion=34.0.0
+dexcount_version=4.0.0
+junit_version=4.12
+test_ext_junit_version=1.1.3
+espresso_core=3.4.0
+
+androidx_work_version=2.9.0
+
+## Common
+
+version=2.2.9
+android_code_version=39

gradle/wrapper/gradle-wrapper.properties

@@ -3,4 +3,4 @@ distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-6.5.1-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.6-bin.zip

maven.publish.gradle

@@ -1,53 +0,0 @@
-apply plugin: 'maven-publish'
-
-task javadocsJar(type: Jar) {
-    classifier = 'javadoc'
-}
-
-afterEvaluate {
-    project.publishing.publications.all {
-        // rename artifacts
-        groupId "${project.group}"
-        if (it.name.contains('kotlinMultiplatform')) {
-            artifactId = "${project.name}"
-        } else {
-            artifactId = "${project.name}-$name"
-        }
-    }
-}
-
-publishing {
-    publications.all {
-        artifact javadocsJar
-
-        pom {
-            description = "It is an analog of crontab util for Kotlin Coroutines"
-            name = "Krontab"
-            url = "https://git.insanusmokrassar.com/InsanusMokrassar/krontab"
-
-            scm {
-                developerConnection = "scm:git:[fetch=]https://git.insanusmokrassar.com:8322/InsanusMokrassar/krontab.git[push=]https://git.insanusmokrassar.com:8322/InsanusMokrassar/krontab.git"
-                url = "https://git.insanusmokrassar.com:8322/InsanusMokrassar/krontab.git"
-            }
-
-            developers {
-                
-                    developer {
-                        id = "InsanusMokrassar"
-                        name = "Ovsiannikov Aleksei"
-                        email = "ovsyannikov.alexey95@gmail.com"
-                    }
-                
-            }
-
-            licenses {
-                
-                    license {
-                        name = "Apache Software License 2.0"
-                        url = "https://git.insanusmokrassar.com/InsanusMokrassar/krontab/src/master/LICENSE"
-                    }
-                
-            }
-        }
-    }
-}

mpp_config.kpsb

@@ -1 +0,0 @@
-{"bintrayConfig":{"repo":"InsanusMokrassar","packageName":"${project.name}-mpp","packageVcs":"https://git.insanusmokrassar.com/InsanusMokrassar/krontab","autoPublish":true,"overridePublish":true},"licenses":[{"id":"Apache-2.0","title":"Apache Software License 2.0","url":"https://git.insanusmokrassar.com/InsanusMokrassar/krontab/src/master/LICENSE"}],"mavenConfig":{"name":"Krontab","description":"It is an analog of crontab util for Kotlin Coroutines","url":"https://git.insanusmokrassar.com/InsanusMokrassar/krontab","vcsUrl":"https://git.insanusmokrassar.com:8322/InsanusMokrassar/krontab.git","developers":[{"id":"InsanusMokrassar","name":"Ovsiannikov Aleksei","eMail":"ovsyannikov.alexey95@gmail.com"}]},"type":"Multiplatform"}

publish.gradle

@@ -1,59 +1,118 @@
-apply plugin: 'com.jfrog.bintray'
+apply plugin: 'maven-publish'
 
-apply from: "maven.publish.gradle"
+task javadocsJar(type: Jar) {
+    archiveClassifier = 'javadoc'
+}
 
-bintray {
+publishing {
-    user = project.hasProperty('BINTRAY_USER') ? project.property('BINTRAY_USER') : System.getenv('BINTRAY_USER')
+    publications.all {
-    key = project.hasProperty('BINTRAY_KEY') ? project.property('BINTRAY_KEY') : System.getenv('BINTRAY_KEY')
+        artifact javadocsJar
-    filesSpec {
+
-        from "${buildDir}/publications/"
+        pom {
-        eachFile {
+            description = "It is an analog of crontab util for Kotlin Coroutines"
-            String directorySubname = it.getFile().parentFile.name
+            name = "Krontab"
-            if (it.getName() == "module.json") {
+            url = "https://github.com/InsanusMokrassar/krontab"
-                if (directorySubname == "kotlinMultiplatform") {
+
-                    it.setPath("${project.name}/${project.version}/${project.name}-${project.version}.module")
+            scm {
-                } else {
+                developerConnection = "scm:git:[fetch=]https://github.com/InsanusMokrassar/krontab.git[push=]https://github.com/InsanusMokrassar/krontab.git"
-                    it.setPath("${project.name}-${directorySubname}/${project.version}/${project.name}-${directorySubname}-${project.version}.module")
+                url = "https://github.com/InsanusMokrassar/krontab.git"
-                }
+            }
-            } else {
+
-                if (directorySubname == "kotlinMultiplatform" && it.getName() == "pom-default.xml") {
+            developers {
-                    it.setPath("${project.name}/${project.version}/${project.name}-${project.version}.pom")
+                
-                } else {
+                    developer {
-                    it.exclude()
+                        id = "InsanusMokrassar"
-                }
+                        name = "Ovsiannikov Aleksei"
+                        email = "ovsyannikov.alexey95@gmail.com"
+                    }
+                
+            }
+
+            licenses {
+                
+                    license {
+                        name = "Apache Software License 2.0"
+                        url = "https://github.com/InsanusMokrassar/krontab/blob/master/LICENSE"
+                    }
+                
             }
         }
-        into "${project.group}".replace(".", "/")
+        repositories {
-    }
+            if ((project.hasProperty('GITHUBPACKAGES_USER') || System.getenv('GITHUBPACKAGES_USER') != null) && (project.hasProperty('GITHUBPACKAGES_PASSWORD') || System.getenv('GITHUBPACKAGES_PASSWORD') != null)) {
-    
+                maven {
-    publish = true
+                    name = "GithubPackages"
-    override = true
+                    url = uri("https://maven.pkg.github.com/InsanusMokrassar/krontab")
-    
+            
-    pkg {
+                    credentials {
-        repo = "InsanusMokrassar"
+                        username = project.hasProperty('GITHUBPACKAGES_USER') ? project.property('GITHUBPACKAGES_USER') : System.getenv('GITHUBPACKAGES_USER')
-        name = "${project.name}-mpp"
+                        password = project.hasProperty('GITHUBPACKAGES_PASSWORD') ? project.property('GITHUBPACKAGES_PASSWORD') : System.getenv('GITHUBPACKAGES_PASSWORD')
-        vcsUrl = "https://git.insanusmokrassar.com/InsanusMokrassar/krontab"
+                    }
-        licenses = ["Apache-2.0"]
+            
-        version {
+                }
-            name = "${project.version}"
+            }
-            released = new Date()
+            if ((project.hasProperty('INMONEXUS_USER') || System.getenv('INMONEXUS_USER') != null) && (project.hasProperty('INMONEXUS_PASSWORD') || System.getenv('INMONEXUS_PASSWORD') != null)) {
-            vcsTag = "${project.version}"
+                maven {
-            gpg {
+                    name = "InmoNexus"
-                sign = true
+                    url = uri("https://nexus.inmo.dev/repository/maven-releases/")
-                passphrase = project.hasProperty('signing.gnupg.passphrase') ? project.property('signing.gnupg.passphrase') : System.getenv('signing.gnupg.passphrase')
+            
+                    credentials {
+                        username = project.hasProperty('INMONEXUS_USER') ? project.property('INMONEXUS_USER') : System.getenv('INMONEXUS_USER')
+                        password = project.hasProperty('INMONEXUS_PASSWORD') ? project.property('INMONEXUS_PASSWORD') : System.getenv('INMONEXUS_PASSWORD')
+                    }
+            
+                }
+            }
+            if ((project.hasProperty('SONATYPE_USER') || System.getenv('SONATYPE_USER') != null) && (project.hasProperty('SONATYPE_PASSWORD') || System.getenv('SONATYPE_PASSWORD') != null)) {
+                maven {
+                    name = "sonatype"
+                    url = uri("https://oss.sonatype.org/service/local/staging/deploy/maven2/")
+            
+                    credentials {
+                        username = project.hasProperty('SONATYPE_USER') ? project.property('SONATYPE_USER') : System.getenv('SONATYPE_USER')
+                        password = project.hasProperty('SONATYPE_PASSWORD') ? project.property('SONATYPE_PASSWORD') : System.getenv('SONATYPE_PASSWORD')
+                    }
+            
+                }
             }
         }
     }
 }
-
+    
-bintrayUpload.doFirst {
+if (project.hasProperty("signing.gnupg.keyName")) {
-    publications = publishing.publications.collect {
+    apply plugin: 'signing'
-        if (it.name.contains('kotlinMultiplatform')) {
+    
-            null
+    signing {
-        } else {
+        useGpgCmd()
-            it.name
+    
+        sign publishing.publications
+    }
+    
+    task signAll {
+        tasks.withType(Sign).forEach {
+            dependsOn(it)
         }
-    } - null
+    }
-}
 
-bintrayUpload.dependsOn publishToMavenLocal
+    // Workaround to make android sign operations depend on signing tasks
+    project.getTasks().withType(AbstractPublishToMaven.class).configureEach {
+        def signingTasks = project.getTasks().withType(Sign.class)
+        mustRunAfter(signingTasks)
+    }
+    // Workaround to make test tasks use sign
+    project.getTasks().withType(Sign.class).configureEach { signTask ->
+        def withoutSign = (signTask.name.startsWith("sign") ? signTask.name.minus("sign") : signTask.name)
+        def pubName = withoutSign.endsWith("Publication") ? withoutSign.substring(0, withoutSign.length() - "Publication".length()) : withoutSign
+        // These tasks only exist for native targets, hence findByName() to avoid trying to find them for other targets
+
+        // Task ':linkDebugTest<platform>' uses this output of task ':sign<platform>Publication' without declaring an explicit or implicit dependency
+        def debugTestTask = tasks.findByName("linkDebugTest$pubName")
+        if (debugTestTask != null) {
+            signTask.mustRunAfter(debugTestTask)
+        }
+        // Task ':compileTestKotlin<platform>' uses this output of task ':sign<platform>Publication' without declaring an explicit or implicit dependency
+        def testTask = tasks.findByName("compileTestKotlin$pubName")
+        if (testTask != null) {
+            signTask.mustRunAfter(testTask)
+        }
+    }
+}

publish.kpsb

@@ -0,0 +1 @@
+{"licenses":[{"id":"Apache-2.0","title":"Apache Software License 2.0","url":"https://github.com/InsanusMokrassar/krontab/blob/master/LICENSE"}],"mavenConfig":{"name":"Krontab","description":"It is an analog of crontab util for Kotlin Coroutines","url":"https://github.com/InsanusMokrassar/krontab","vcsUrl":"https://github.com/InsanusMokrassar/krontab.git","developers":[{"id":"InsanusMokrassar","name":"Ovsiannikov Aleksei","eMail":"ovsyannikov.alexey95@gmail.com"}],"repositories":[{"name":"GithubPackages","url":"https://maven.pkg.github.com/InsanusMokrassar/krontab"},{"name":"InmoNexus","url":"https://nexus.inmo.dev/repository/maven-releases/"},{"name":"sonatype","url":"https://oss.sonatype.org/service/local/staging/deploy/maven2/"}],"gpgSigning":{"type":"dev.inmo.kmppscriptbuilder.core.models.GpgSigning.Optional"}}}

renovate.json

@@ -0,0 +1,6 @@
+{
+  "$schema": "https://docs.renovatebot.com/renovate-schema.json",
+  "extends": [
+    "config:base"
+  ]
+}

src/androidMain/kotlin/KronSchedulerWork.kt

@@ -0,0 +1,148 @@
+package dev.inmo.krontab
+
+import android.content.Context
+import androidx.work.*
+import korlibs.time.DateTime
+import korlibs.time.millisecondsLong
+import java.util.concurrent.TimeUnit
+
+/**
+ * This method will enqueue [OneTimeWorkRequest] with [workName] and [existingWorkPolicy]. Use [setUpRequest] callback
+ * in case you need some additional actions to do before request will be enqueued
+ */
+suspend fun <T : KronSchedulerWork> Context.enqueueKronSchedulerWork(
+    workName: String,
+    delayMillis: Long,
+    workClass: Class<T>,
+    existingWorkPolicy: ExistingWorkPolicy = ExistingWorkPolicy.REPLACE,
+    setUpRequest: suspend OneTimeWorkRequest.Builder.() -> Unit = {}
+) = WorkManager.getInstance(applicationContext).enqueueUniqueWork(
+    workName,
+    existingWorkPolicy,
+    OneTimeWorkRequest.Builder(workClass).apply {
+        setInitialDelay(delayMillis, TimeUnit.MILLISECONDS)
+        setUpRequest()
+    }.build()
+)
+/**
+ * This method is shortcut for [enqueueKronSchedulerWork] with reified [T] parameter
+ */
+suspend inline fun <reified T : KronSchedulerWork> Context.enqueueKronSchedulerWork(
+    workName: String,
+    delayMillis: Long,
+    existingWorkPolicy: ExistingWorkPolicy = ExistingWorkPolicy.REPLACE,
+    noinline setUpRequest: suspend OneTimeWorkRequest.Builder.() -> Unit = {}
+) = enqueueKronSchedulerWork(workName, delayMillis, T::class.java, existingWorkPolicy, setUpRequest)
+
+/**
+ * This method is shortcut for [enqueueKronSchedulerWork] with [initialScheduler]. It will try to calculate delay by
+ * itself. In case if [KronScheduler.next] of [initialScheduler] will return null, work WILL NOT be enqueued
+ *
+ * @return null in case if [KronScheduler.next] of [initialScheduler] has returned null and work has not been enqueued
+ */
+suspend fun <T : KronSchedulerWork> Context.enqueueKronSchedulerWork(
+    workName: String,
+    initialScheduler: KronScheduler,
+    workClass: Class<T>,
+    existingWorkPolicy: ExistingWorkPolicy = ExistingWorkPolicy.REPLACE,
+    setUpRequest: suspend OneTimeWorkRequest.Builder.() -> Unit = {}
+): Operation? {
+    val now = DateTime.now()
+    val nextTriggerTime = initialScheduler.next(now)
+    val delayMillis = nextTriggerTime ?.minus(now) ?.millisecondsLong ?: return null
+
+    return enqueueKronSchedulerWork(workName, delayMillis, workClass, existingWorkPolicy, setUpRequest)
+}
+/**
+ * This method is shortcut for [enqueueKronSchedulerWork] with reified [T]
+ */
+suspend inline fun <reified T : KronSchedulerWork> Context.enqueueKronSchedulerWork(
+    workName: String,
+    initialScheduler: KronScheduler,
+    existingWorkPolicy: ExistingWorkPolicy = ExistingWorkPolicy.REPLACE,
+    noinline setUpRequest: suspend OneTimeWorkRequest.Builder.() -> Unit = {}
+) = enqueueKronSchedulerWork(workName, initialScheduler, T::class.java, existingWorkPolicy, setUpRequest)
+
+/**
+ * Use this class as a super class in case you wish to implement krontab-based enqueuing of works
+ *
+ * @see enqueueKronSchedulerWork
+ * @see KrontabTemplateSchedulerWork
+ */
+abstract class KronSchedulerWork(
+    context: Context,
+    workerParams: WorkerParameters
+) : CoroutineWorker(
+    context,
+    workerParams
+) {
+    /**
+     * This variable will be used to reorder new work after that one is happen
+     *
+     * @see prolongOnException
+     * @see prolongOnFailure
+     * @see prolongOnSuccess
+     */
+    protected abstract val workName: String
+
+    /**
+     * Set this to false in case when this work must not be enqueued after successful complete
+     */
+    protected open val prolongOnSuccess: Boolean = true
+    /**
+     * Set this to false in case when this work must not be enqueued after failure complete
+     */
+    protected open val prolongOnFailure
+        get() = prolongOnSuccess
+    /**
+     * Set this to false in case when this work must not be enqueued after exception happen
+     */
+    protected open val prolongOnException = false
+
+    /**
+     * [KronScheduler] of this method will be used to [prolong] this worker
+     */
+    protected abstract suspend fun kronScheduler(): KronScheduler?
+
+    /**
+     * This method is replacement of [doWork]. It is required to wrap work with [prolong]ing and handling of complete
+     * state
+     */
+    protected abstract suspend fun onWork(): Result
+
+    /**
+     * Override this method in case you have some additional settings for future [OneTimeWorkRequest]
+     */
+    protected open suspend fun OneTimeWorkRequest.Builder.setUpRequest() {}
+
+    /**
+     * This method will [enqueueKronSchedulerWork] using [workName], [kronScheduler] and default
+     * [ExistingWorkPolicy.REPLACE]. You can call this method in case you want to enqueue work by yourself, but you must
+     * be sure that you set up to false [prolongOnSuccess], [prolongOnFailure] and [prolongOnException]
+     */
+    protected suspend fun prolong() {
+        applicationContext.enqueueKronSchedulerWork(
+            workName,
+            kronScheduler() ?: return,
+            this::class.java
+        ) {
+            setUpRequest()
+        }
+    }
+
+    override suspend fun doWork(): Result {
+        val result = try {
+            onWork()
+        } catch (e: Throwable) {
+            if (prolongOnException) {
+                prolong()
+            }
+            throw e
+        }
+        when (result) {
+            is Result.Failure -> if (prolongOnFailure) prolong()
+            is Result.Success -> if (prolongOnSuccess) prolong()
+        }
+        return result
+    }
+}

src/androidMain/kotlin/KrontabTemplateSchedulerWork.kt

@@ -0,0 +1,68 @@
+package dev.inmo.krontab
+
+import android.content.Context
+import androidx.work.*
+
+const val krontabTemplateWorkField = "krontabTemplate"
+
+/**
+ * Will [enqueueKronSchedulerWork] with [KronScheduler] from [krontabTemplate] and call [setUpRequest] on setting up
+ * [OneTimeWorkRequest.Builder] with [Data] which will be used to [OneTimeWorkRequest.Builder.setInputData] after
+ * [setUpRequest] completed
+ */
+suspend inline fun <reified T : KrontabTemplateSchedulerWork> Context.enqueueKrontabTemplateSchedulerWork(
+    workName: String,
+    krontabTemplate: KrontabTemplate,
+    existingWorkPolicy: ExistingWorkPolicy = ExistingWorkPolicy.REPLACE,
+    noinline setUpRequest: suspend OneTimeWorkRequest.Builder.(
+        data: Data
+    ) -> Unit = {}
+) = enqueueKronSchedulerWork(workName, krontabTemplate.toKronScheduler(), T::class.java, existingWorkPolicy) {
+    val data = workDataOf(
+        krontabTemplateWorkField to krontabTemplate
+    )
+    setUpRequest(data)
+    setInputData(data)
+}
+
+/**
+ * Extend this class in case you wish to base on [KrontabTemplate]. It will automatically handle request of
+ * [kronScheduler] and put it in [setUpRequest]
+ */
+abstract class KrontabTemplateSchedulerWork(
+    context: Context,
+    workerParams: WorkerParameters
+) : KronSchedulerWork(context, workerParams) {
+    /**
+     * Will try to get [KrontabTemplate] from [getInputData] by key [krontabTemplateWorkField]
+     *
+     * @see setUpRequest
+     */
+    protected val krontabTemplate: KrontabTemplate?
+        get() = inputData.getString(krontabTemplateWorkField)
+
+    /**
+     * Override this methods instead of old [setUpRequest] in case you wish to set up some work request parameters
+     *
+     * @param data This parameter will be used to put data inside of [OneTimeWorkRequest.Builder] after this method
+     * will be completed
+     */
+    protected open suspend fun OneTimeWorkRequest.Builder.setUpRequest(data: Data) {}
+
+    /**
+     * Will automatically put [krontabTemplate] into work data, call [setUpRequest] with future [Data] object and then
+     * call [OneTimeWorkRequest.Builder.setInputData] with that [Data] object
+     */
+    override suspend fun OneTimeWorkRequest.Builder.setUpRequest() {
+        val data = workDataOf(
+            krontabTemplateWorkField to krontabTemplate,
+        )
+        setUpRequest(data)
+        setInputData(data)
+    }
+
+    /**
+     * Will return [KronScheduler] in case if [krontabTemplate] was not null
+     */
+    override suspend fun kronScheduler(): KronScheduler? = krontabTemplate ?.toKronScheduler()
+}

src/commonMain/kotlin/Executes.kt

@@ -0,0 +1,175 @@
+package dev.inmo.krontab
+
+import korlibs.time.DateTime
+import korlibs.time.DateTimeTz
+import korlibs.time.millisecondsLong
+import kotlinx.coroutines.delay
+import kotlinx.coroutines.isActive
+import kotlin.coroutines.coroutineContext
+
+
+/**
+ * Execute [block] once at the [KronScheduler.next] time and return result of [block] calculation.
+ *
+ * WARNING!!! If you want to launch it in parallel, you must do this explicitly.
+ *
+ * WARNING!!! In case if [KronScheduler.next] of [this] instance will return null, [block] will be called immediately
+ */
+suspend inline fun <T> KronScheduler.doOnce(block: (DateTime) -> T): T {
+    val time = nextOrNow().also {
+        delay((it - DateTime.now()).millisecondsLong)
+    }
+    return block(time)
+}
+
+/**
+ * Execute [block] once at the [KronScheduler.next] time and return result of [block] calculation.
+ *
+ * WARNING!!! If you want to launch it in parallel, you must do this explicitly.
+ *
+ * WARNING!!! In case if [KronScheduler.next] of [this] instance will return null, [block] will be called immediately
+ */
+@Deprecated("Replaceable", ReplaceWith("doOnce", "dev.inmo.krontab.doOnce"))
+suspend inline fun <T> KronScheduler.doOnceLocal(block: (DateTime) -> T): T = doOnce(block)
+
+/**
+ * Execute [block] once at the [KronScheduler.next] time and return result of [block] calculation.
+ *
+ * WARNING!!! If you want to launch it in parallel, you must do this explicitly.
+ *
+ * WARNING!!! In case if [KronScheduler.next] of [this] instance will return null, [block] will be called immediatelly
+ */
+suspend inline fun <T> KronScheduler.doOnceTz(noinline block: suspend (DateTimeTz) -> T): T {
+    val time = when (this) {
+        is KronSchedulerTz -> nextOrNowWithOffset()
+        else -> nextOrNow().local
+    }
+    delay((time - DateTimeTz.nowLocal()).millisecondsLong)
+    return block(time)
+}
+
+/**
+ * Will [buildSchedule] using [scheduleConfig] and call [doOnce] on it
+ * @see buildSchedule
+ */
+suspend inline fun <T> doOnce(
+    scheduleConfig: String,
+    block: (DateTime) -> T
+) = buildSchedule(scheduleConfig).doOnce(block)
+
+/**
+ * Will [buildSchedule] using [scheduleConfig] and call [doOnce] on it
+ * @see buildSchedule
+ */
+suspend inline fun <T> doOnceTz(
+    scheduleConfig: String,
+    noinline block: suspend (DateTimeTz) -> T
+) = buildSchedule(scheduleConfig).doOnceTz(block)
+
+
+/**
+ * Will execute [block] while it will return true as a result of its calculation
+ */
+suspend inline fun KronScheduler.doWhile(block: (DateTime) -> Boolean) {
+    do {
+        delay(1L)
+    } while (doOnce(block))
+}
+/**
+ * Will execute [block] while it will return true as a result of its calculation
+ */
+@Deprecated("Replaceable", ReplaceWith("doWhile", "dev.inmo.krontab.doWhile"))
+suspend inline fun KronScheduler.doWhileLocal(block: (DateTime) -> Boolean) = doWhile(block)
+
+/**
+ * Will execute [block] while it will return true as a result of its calculation
+ */
+suspend inline fun KronScheduler.doWhileTz(noinline block: suspend (DateTimeTz) -> Boolean) {
+    do {
+        delay(1L)
+    } while (doOnceTz(block))
+}
+
+/**
+ * Will [buildSchedule] using [scheduleConfig] and call [doWhile] with [block]
+ *
+ * @see buildSchedule
+ */
+suspend inline fun doWhile(
+    scheduleConfig: String,
+    block: (DateTime) -> Boolean
+) = buildSchedule(scheduleConfig).doWhile(block)
+
+/**
+ * Will [buildSchedule] using [scheduleConfig] and call [doWhile] with [block]
+ *
+ * @see buildSchedule
+ */
+@Deprecated("Replaceable", ReplaceWith("doWhile", "dev.inmo.krontab.doWhile"))
+suspend inline fun doWhileLocal(
+    scheduleConfig: String,
+    block: (DateTime) -> Boolean
+) = doWhile(scheduleConfig, block)
+
+/**
+ * Will [buildSchedule] using [scheduleConfig] and call [doWhile] with [block]
+ *
+ * @see buildSchedule
+ */
+suspend inline fun doWhileTz(
+    scheduleConfig: String,
+    noinline block: suspend (DateTimeTz) -> Boolean
+) = buildSchedule(scheduleConfig).doWhileTz(block)
+
+
+/**
+ * Will execute [block] without any checking of result
+ */
+suspend inline fun KronScheduler.doInfinity(block: (DateTime) -> Unit) = doWhile {
+    block(it)
+    coroutineContext.isActive
+}
+/**
+ * Will execute [block] without any checking of result
+ */
+@Deprecated("Replaceable", ReplaceWith("doInfinity", "dev.inmo.krontab.doInfinity"))
+suspend inline fun KronScheduler.doInfinityLocal(block: (DateTime) -> Unit) = doInfinity(block)
+
+/**
+ * Will execute [block] without any checking of result
+ */
+suspend inline fun KronScheduler.doInfinityTz(noinline block: suspend (DateTimeTz) -> Unit) = doWhileTz {
+    block(it)
+    coroutineContext.isActive
+}
+
+/**
+ * Will [buildSchedule] using [scheduleConfig] and call [doInfinity] with [block]
+ *
+ * @see buildSchedule
+ */
+suspend inline fun doInfinity(
+    scheduleConfig: String,
+    block: (DateTime) -> Unit
+) = buildSchedule(scheduleConfig).doInfinity(block)
+
+/**
+ * Will [buildSchedule] using [scheduleConfig] and call [doInfinity] with [block]
+ *
+ * @see buildSchedule
+ */
+@Deprecated("Replaceable", ReplaceWith("doInfinity", "dev.inmo.krontab.doInfinity"))
+suspend inline fun doInfinityLocal(
+    scheduleConfig: String,
+    block: (DateTime) -> Unit
+) = doInfinity(scheduleConfig, block)
+
+/**
+ * Will [buildSchedule] using [scheduleConfig] and call [doInfinity] with [block]
+ *
+ * @see buildSchedule
+ */
+suspend inline fun doInfinityTz(
+    scheduleConfig: String,
+    noinline block: suspend (DateTimeTz) -> Unit
+) = buildSchedule(scheduleConfig).doInfinityTz(block)

src/commonMain/kotlin/KronScheduler.kt

@@ -0,0 +1,28 @@
+package dev.inmo.krontab
+
+import korlibs.time.DateTime
+
+/**
+ * This interface was created for abstraction of [next] operation. Currently, there is only
+ * [dev.inmo.krontab.internal.CronDateTimeScheduler] realisation of this interface inside of this library,
+ * but you it is possible to create your own realisation of this interface for scheduling, for example, depending of
+ * users activity or something like this
+ *
+ * @see dev.inmo.krontab.internal.CronDateTimeScheduler
+ */
+interface KronScheduler {
+
+    /**
+     * @return Next [DateTime] when some action must be triggered according to settings of this instance
+     *
+     * @see dev.inmo.krontab.internal.CronDateTimeScheduler.next
+     */
+    suspend fun next(relatively: DateTime = DateTime.now()): DateTime?
+
+    companion object
+}
+
+suspend fun KronScheduler.nextOrRelative(relatively: DateTime = DateTime.now()): DateTime = next(relatively) ?: getAnyNext(relatively)
+suspend fun KronScheduler.nextOrNow(): DateTime = DateTime.now().let {
+    next(it) ?: getAnyNext(it)
+}

src/commonMain/kotlin/KronSchedulerTz.kt

@@ -0,0 +1,34 @@
+package dev.inmo.krontab
+
+import korlibs.time.DateTime
+import korlibs.time.DateTimeTz
+
+/**
+ * This interface extending [KronScheduler] to use [DateTimeTz] with taking into account offset of incoming time for
+ * [next] operation.
+ *
+ * @see dev.inmo.krontab.internal.CronDateTimeScheduler
+ * @see dev.inmo.krontab.KronScheduler
+ */
+interface KronSchedulerTz : KronScheduler {
+    suspend fun next(relatively: DateTimeTz): DateTimeTz?
+
+    override suspend fun next(relatively: DateTime): DateTime? = next(relatively.local) ?.local
+}
+
+suspend fun KronSchedulerTz.nextOrRelative(relatively: DateTimeTz): DateTimeTz = next(relatively) ?: getAnyNext(
+    relatively.local
+).toOffsetUnadjusted(relatively.offset)
+suspend fun KronSchedulerTz.nextOrNowWithOffset(): DateTimeTz = DateTimeTz.nowLocal().let {
+    next(it) ?: getAnyNext(
+        it.local
+    ).toOffsetUnadjusted(it.offset)
+}
+
+suspend fun KronScheduler.next(relatively: DateTimeTz) = if (this is KronSchedulerTz) {
+    this.next(relatively)
+} else {
+    this.next(relatively.local) ?.toOffsetUnadjusted(relatively.offset)
+}
+
+suspend fun KronScheduler.nextTimeZoned() = next(DateTime.now().local)

src/commonMain/kotlin/KronSchedulersMerging.kt

@@ -0,0 +1,46 @@
+package dev.inmo.krontab
+
+import dev.inmo.krontab.collection.CollectionKronScheduler
+import dev.inmo.krontab.collection.includeAll
+import dev.inmo.krontab.internal.*
+
+/**
+ * Create new one [CollectionKronScheduler] to include all [KronScheduler]s of [this] [Iterator]
+ *
+ * @see CollectionKronScheduler
+ * @see CollectionKronScheduler.include
+ */
+fun Iterator<KronScheduler>.merge(): CollectionKronScheduler {
+    val cronDateTimes = mutableListOf<CronDateTime>()
+    val timezonedCronDateTimes = mutableListOf<CronDateTimeSchedulerTz>()
+    val collectionScheduler = CollectionKronScheduler()
+    forEach {
+        when (it) {
+            is CronDateTimeScheduler -> cronDateTimes.add(it.cronDateTime)
+            is CronDateTimeSchedulerTz -> timezonedCronDateTimes.add(it)
+            else -> collectionScheduler.include(it)
+        }
+    }
+    if (cronDateTimes.isNotEmpty()) {
+        collectionScheduler.include(CronDateTimeScheduler(cronDateTimes.merge()))
+    }
+    if (timezonedCronDateTimes.isNotEmpty()) {
+        collectionScheduler.includeAll(mergeCronDateTimeSchedulers(timezonedCronDateTimes))
+    }
+    return collectionScheduler
+}
+
+/**
+ * Create new one [CollectionKronScheduler] to include all [KronScheduler]s of [this] [Iterator]
+ *
+ * @see CollectionKronScheduler
+ * @see CollectionKronScheduler.include
+ */
+@Suppress("NOTHING_TO_INLINE")
+inline fun Iterable<KronScheduler>.merge(): CollectionKronScheduler = iterator().merge()
+
+/**
+ * @return Vararg shortcut for [merge]
+ */
+@Suppress("NOTHING_TO_INLINE")
+inline fun merge(vararg kronDateTimeSchedulers: KronScheduler): CollectionKronScheduler = kronDateTimeSchedulers.iterator().merge()

src/commonMain/kotlin/KrontabConfig.kt

@@ -0,0 +1,165 @@
+package dev.inmo.krontab
+
+import dev.inmo.krontab.internal.CronDateTimeScheduler
+import dev.inmo.krontab.internal.CronDateTimeSchedulerTz
+import dev.inmo.krontab.internal.createKronScheduler
+import dev.inmo.krontab.internal.createKronSchedulerWithOffset
+import dev.inmo.krontab.internal.millisecondsArrayDefault
+import dev.inmo.krontab.internal.parseDaysOfMonth
+import dev.inmo.krontab.internal.parseHours
+import dev.inmo.krontab.internal.parseMilliseconds
+import dev.inmo.krontab.internal.parseMinutes
+import dev.inmo.krontab.internal.parseMonths
+import dev.inmo.krontab.internal.parseOffset
+import dev.inmo.krontab.internal.parseSeconds
+import dev.inmo.krontab.internal.parseWeekDay
+import dev.inmo.krontab.internal.parseYears
+import dev.inmo.krontab.utils.Minutes
+import korlibs.time.TimezoneOffset
+import korlibs.time.minutes
+import kotlinx.serialization.Serializable
+import kotlin.jvm.JvmInline
+
+/**
+ * This value class contains [KrontabTemplate]
+ *
+ * * **seconds**
+ * * **minutes**
+ * * **hours**
+ * * **dayOfMonth**
+ * * **month**
+ * * **year** (optional)
+ * * **offset** (optional) (can be placed anywhere after month) (must be marked with `o` at the end, for example: 60o == +01:00)
+ * * **dayOfWeek** (optional) (can be placed anywhere after month)
+ * * **milliseconds** (optional) (can be placed anywhere after month) (must be marked with `ms` at the end, for example: 500ms; 100-200ms)
+ *
+ * And each one (except of offsets) have next format:
+ *
+ * `{number}[,{number},...]` or `*`
+ *
+ * and {number} here is one of
+ *
+ * * {int}-{int}
+ * * {int}/{int}
+ * * */{int}
+ * * {int}
+ * * F
+ * * L
+ *
+ * Week days must be marked with `w` at the end, and starts with 0 which means Sunday. For example, 0w == Sunday. With
+ * weeks you can use syntax like with any number like seconds, for example: 0-2w means Sunday-Tuesday
+ *
+ * Additional info about ranges can be found in follow accordance:
+ *
+ * * Seconds ranges can be found in [secondsRange]
+ * * Minutes ranges can be found in [minutesRange]
+ * * Hours ranges can be found in [hoursRange]
+ * * Days of month ranges can be found in [dayOfMonthRange]
+ * * Months ranges can be found in [monthRange]
+ * * Years ranges can be found in [yearRange] (in fact - any [Int])
+ * * WeekDay (timezone) ranges can be found in [dayOfWeekRange]
+ * * Milliseconds ranges can be found in [millisecondsRange]
+ *
+ * Examples:
+ *
+ * * "0/5 * * * *" for every five seconds triggering
+ * * "0/5,L * * * *" for every five seconds triggering and on 59 second
+ * * "0/15 30 * * *" for every 15th seconds in a half of each hour
+ * * "0/15 30 * * * 500ms" for every 15th seconds in a half of each hour when milliseconds equal to 500
+ * * "1 2 3 F,4,L 5" for triggering in near first second of second minute of third hour of first, fifth and last days of may
+ * * "1 2 3 F,4,L 5 60o" for triggering in near first second of second minute of third hour of first, fifth and last days of may with timezone UTC+01:00
+ * * "1 2 3 F,4,L 5 60o 0-2w" for triggering in near first second of second minute of third hour of first, fifth and last days of may in case if it will be in Sunday-Tuesday week days with timezone UTC+01:00
+ * * "1 2 3 F,4,L 5 2021" for triggering in near first second of second minute of third hour of first, fifth and last days of may of 2021st year
+ * * "1 2 3 F,4,L 5 2021 60o" for triggering in near first second of second minute of third hour of first, fifth and last days of may of 2021st year with timezone UTC+01:00
+ * * "1 2 3 F,4,L 5 2021 60o 0-2w" for triggering in near first second of second minute of third hour of first, fifth and last days of may of 2021st year if it will be in Sunday-Tuesday week days with timezone UTC+01:00
+ * * "1 2 3 F,4,L 5 2021 60o 0-2w 500ms" for triggering in near first second of second minute of third hour of first, fifth and last days of may of 2021st year if it will be in Sunday-Tuesday week days with timezone UTC+01:00 when milliseconds will be equal to 500
+ *
+ * @see dev.inmo.krontab.internal.createKronScheduler
+ */
+@Serializable
+@JvmInline
+value class KrontabConfig(
+    @Suppress("MemberVisibilityCanBePrivate")
+    val template: KrontabTemplate
+) {
+    /**
+     * Creates __new__ [KronScheduler] based on a [template]
+     *
+     * @return In case when offset parameter is absent in [template] will be used [createSimpleScheduler] method and
+     * returned [CronDateTimeScheduler]. In case when offset parameter there is in [template] [KrontabTemplate] will be used
+     * [createKronSchedulerWithOffset] and returned [CronDateTimeSchedulerTz]
+     */
+    fun scheduler(): KronScheduler {
+        var offsetParsed: Int? = null
+        var dayOfWeekParsed: Array<Byte>? = null
+        var yearParsed: Array<Int>? = null
+        var millisecondsParsed: Array<Short>? = null
+        val (secondsSource, minutesSource, hoursSource, dayOfMonthSource, monthSource) = template.split(" ").also {
+            listOfNotNull(
+                it.getOrNull(5),
+                it.getOrNull(6),
+                it.getOrNull(7),
+                it.getOrNull(8)
+            ).forEach {
+                val offsetFromString = parseOffset(it)
+                val dayOfWeekFromString = parseWeekDay(it)
+                val millisecondsFromString = parseMilliseconds(it)
+                offsetParsed = offsetParsed ?: offsetFromString
+                dayOfWeekParsed = dayOfWeekParsed ?: dayOfWeekFromString
+                millisecondsParsed = millisecondsParsed ?: millisecondsFromString
+                when {
+                    dayOfWeekFromString != null || offsetFromString != null || millisecondsFromString != null -> return@forEach
+                    yearParsed == null -> {
+                        yearParsed = parseYears(it)
+                    }
+                }
+            }
+        }
+
+        val secondsParsed = parseSeconds(secondsSource)
+        val minutesParsed = parseMinutes(minutesSource)
+        val hoursParsed = parseHours(hoursSource)
+        val dayOfMonthParsed = parseDaysOfMonth(dayOfMonthSource)
+        val monthParsed = parseMonths(monthSource)
+
+        return offsetParsed ?.let { offset ->
+            createKronSchedulerWithOffset(
+                secondsParsed,
+                minutesParsed,
+                hoursParsed,
+                dayOfMonthParsed,
+                monthParsed,
+                yearParsed,
+                dayOfWeekParsed,
+                TimezoneOffset(offset.minutes),
+                millisecondsParsed ?: millisecondsArrayDefault
+            )
+        } ?: createKronScheduler(
+            secondsParsed,
+            minutesParsed,
+            hoursParsed,
+            dayOfMonthParsed,
+            monthParsed,
+            yearParsed,
+            dayOfWeekParsed,
+            millisecondsParsed ?: millisecondsArrayDefault
+        )
+    }
+
+    /**
+     * Creates base [KronScheduler] using [scheduler] function. In case when returned [KronScheduler] is [KronSchedulerTz],
+     * it will be returned as is. Otherwise, will be created new [CronDateTimeSchedulerTz] with [defaultOffset] as
+     * offset
+     */
+    fun scheduler(defaultOffset: Minutes): KronSchedulerTz {
+        val scheduler = scheduler()
+        return if (scheduler is KronSchedulerTz) {
+            scheduler
+        } else {
+            CronDateTimeSchedulerTz(
+                (scheduler as CronDateTimeScheduler).cronDateTime,
+                TimezoneOffset(defaultOffset.minutes)
+            )
+        }
+    }
+}

src/commonMain/kotlin/KrontabTemplateWrapper.kt

@@ -0,0 +1,26 @@
+package dev.inmo.krontab
+
+/**
+ * This class contains [template] and can be simply serialized/deserialized. In fact that class will work as
+ * [dev.inmo.krontab.internal.CronDateTimeScheduler] due to the fact that [toKronScheduler] will return it under the
+ * hood
+ */
+@Deprecated(
+    "It is useless wrapper for KrontabTemplate. Use KrontabConfig instead",
+    ReplaceWith("KrontabConfig(template)", "dev.inmo.krontab.KrontabConfig")
+)
+data class KrontabTemplateWrapper(
+    val template: KrontabTemplate
+) : KronScheduler by template.toKronScheduler()
+
+/**
+ * Will create [KrontabTemplateWrapper] from [this] [KrontabTemplate]
+ *
+ * @see [toKronScheduler]
+ * @see [KrontabTemplateWrapper]
+ */
+@Deprecated(
+    "Will be removed in near major update with KrontabTemplateWrapper",
+    ReplaceWith("this.krontabConfig", "dev.inmo.krontab.krontabConfig")
+)
+fun KrontabTemplate.wrapAsKronScheduler() = KrontabTemplateWrapper(this)

src/commonMain/kotlin/LambdaKronScheduler.kt

@@ -0,0 +1,13 @@
+package dev.inmo.krontab
+
+import korlibs.time.DateTime
+
+class LambdaKronScheduler(
+    private val onNext: suspend (DateTime) -> DateTime?
+) : KronScheduler {
+    override suspend fun next(relatively: DateTime): DateTime? = onNext(relatively)
+}
+
+fun KronScheduler(
+    onNext: suspend (DateTime) -> DateTime?
+) = LambdaKronScheduler(onNext)

src/commonMain/kotlin/LambdaKronSchedulerTz.kt

@@ -0,0 +1,13 @@
+package dev.inmo.krontab
+
+import korlibs.time.DateTimeTz
+
+class LambdaKronSchedulerTz(
+    private val onNext: suspend (DateTimeTz) -> DateTimeTz?
+) : KronSchedulerTz {
+    override suspend fun next(relatively: DateTimeTz): DateTimeTz? = onNext(relatively)
+}
+
+fun KronSchedulerTz(
+    onNext: suspend (DateTimeTz) -> DateTimeTz?
+) = LambdaKronSchedulerTz(onNext)

src/commonMain/kotlin/SchedulerShortcuts.kt

@@ -0,0 +1,133 @@
+package dev.inmo.krontab
+
+import korlibs.time.DateTime
+import dev.inmo.krontab.builder.buildSchedule
+import dev.inmo.krontab.internal.*
+
+internal val anyCronDateTime by lazy {
+    CronDateTime()
+}
+internal fun getAnyNext(relatively: DateTime) = anyCronDateTime.toNearDateTime(relatively)!!
+
+/**
+ * [KronScheduler.next] will always return [korlibs.time.DateTime.now]
+ */
+val AnyTimeScheduler: KronScheduler by lazy {
+    CronDateTimeScheduler(anyCronDateTime)
+}
+
+/**
+ * [KronScheduler.next] will always return [korlibs.time.DateTime.now] + one millisecond
+ */
+val EveryMillisecondScheduler: KronScheduler by lazy {
+    buildSchedule { milliseconds { 0 every 1 } }
+}
+
+/**
+ * [KronScheduler.next] will always return [korlibs.time.DateTime.now] + one second
+ */
+val EverySecondScheduler: KronScheduler by lazy {
+    buildSchedule { seconds { 0 every 1 } }
+}
+
+/**
+ * [KronScheduler.next] will always return [korlibs.time.DateTime.now] + one minute
+ */
+val EveryMinuteScheduler: KronScheduler by lazy {
+    buildSchedule {
+        seconds { at(0) }
+        minutes { 0 every 1 }
+    }
+}
+
+/**
+ * [KronScheduler.next] will always return [korlibs.time.DateTime.now] + one hour
+ */
+val EveryHourScheduler: KronScheduler by lazy {
+    buildSchedule {
+        seconds { at(0) }
+        minutes { at(0) }
+        hours { 0 every 1 }
+    }
+}
+
+/**
+ * [KronScheduler.next] will always return [korlibs.time.DateTime.now] + one day
+ */
+val EveryDayOfMonthScheduler: KronScheduler by lazy {
+    buildSchedule {
+        seconds { at(0) }
+        minutes { at(0) }
+        hours { at(0) }
+        dayOfMonth { 0 every 1 }
+    }
+}
+
+/**
+ * [KronScheduler.next] will always return [korlibs.time.DateTime.now] + one month
+ */
+val EveryMonthScheduler: KronScheduler by lazy {
+    buildSchedule {
+        seconds { at(0) }
+        minutes { at(0) }
+        hours { at(0) }
+        dayOfMonth { at(0) }
+        months { 0 every 1 }
+    }
+}
+
+/**
+ * [KronScheduler.next] will always return [korlibs.time.DateTime.now] + one year
+ */
+val EveryYearScheduler: KronScheduler by lazy {
+    buildSchedule {
+        seconds { at(0) }
+        minutes { at(0) }
+        hours { at(0) }
+        dayOfMonth { at(0) }
+        months { at(0) }
+        years { 0 every 1 }
+    }
+}
+
+/**
+ * Shortcut for [EveryMillisecondScheduler]
+ */
+inline val KronScheduler.Companion.everyMillisecond
+    get() = EveryMillisecondScheduler
+
+/**
+ * Shortcut for [EverySecondScheduler]
+ */
+inline val KronScheduler.Companion.everySecond
+    get() = EverySecondScheduler
+
+/**
+ * Shortcut for [EveryMinuteScheduler]
+ */
+inline val KronScheduler.Companion.everyMinute
+    get() = EveryMinuteScheduler
+
+/**
+ * Shortcut for [EveryHourScheduler]
+ */
+inline val KronScheduler.Companion.hourly
+    get() = EveryHourScheduler
+
+/**
+ * Shortcut for [EveryDayOfMonthScheduler]
+ */
+inline val KronScheduler.Companion.daily
+    get() = EveryDayOfMonthScheduler
+
+/**
+ * Shortcut for [EveryMonthScheduler]
+ */
+inline val KronScheduler.Companion.monthly
+    get() = EveryMonthScheduler
+
+/**
+ * Shortcut for [EveryYearScheduler]
+ */
+inline val KronScheduler.Companion.annually
+    get() = EveryYearScheduler

src/commonMain/kotlin/StringParser.kt

@@ -0,0 +1,109 @@
+package dev.inmo.krontab
+
+import dev.inmo.krontab.internal.*
+import dev.inmo.krontab.utils.Minutes
+
+/**
+ * @see createSimpleScheduler
+ * @see buildSchedule
+ */
+typealias KrontabTemplate = String
+
+inline fun KrontabTemplate.krontabConfig() = KrontabConfig(this)
+
+/**
+ * Parse [incoming] string and adapt according to next format: "* * * * *" where order of things:
+ *
+ * * **seconds**
+ * * **minutes**
+ * * **hours**
+ * * **dayOfMonth**
+ * * **month**
+ * * **year** (optional)
+ * * **offset** (optional) (can be placed anywhere after month) (must be marked with `o` at the end, for example: 60o == +01:00)
+ * * **dayOfWeek** (optional) (can be placed anywhere after month)
+ * * **milliseconds** (optional) (can be placed anywhere after month) (must be marked with `ms` at the end, for example: 500ms; 100-200ms)
+ *
+ * And each one (except of offsets) have next format:
+ *
+ * `{number}[,{number},...]` or `*`
+ *
+ * and {number} here is one of
+ *
+ * * {int}-{int}
+ * * {int}/{int}
+ * * */{int}
+ * * {int}
+ * * F
+ * * L
+ *
+ * Week days must be marked with `w` at the end, and starts with 0 which means Sunday. For example, 0w == Sunday. With
+ * weeks you can use syntax like with any number like seconds, for example: 0-2w means Sunday-Tuesday
+ *
+ * Additional info about ranges can be found in follow accordance:
+ *
+ * * Seconds ranges can be found in [secondsRange]
+ * * Minutes ranges can be found in [minutesRange]
+ * * Hours ranges can be found in [hoursRange]
+ * * Days of month ranges can be found in [dayOfMonthRange]
+ * * Months ranges can be found in [monthRange]
+ * * Years ranges can be found in [yearRange] (in fact - any [Int])
+ * * WeekDay (timezone) ranges can be found in [dayOfWeekRange]
+ * * Milliseconds ranges can be found in [millisecondsRange]
+ *
+ * Examples:
+ *
+ * * "0/5 * * * *" for every five seconds triggering
+ * * "0/5,L * * * *" for every five seconds triggering and on 59 second
+ * * "0/15 30 * * *" for every 15th seconds in a half of each hour
+ * * "0/15 30 * * * 500ms" for every 15th seconds in a half of each hour when milliseconds equal to 500
+ * * "1 2 3 F,4,L 5" for triggering in near first second of second minute of third hour of first, fifth and last days of may
+ * * "1 2 3 F,4,L 5 60o" for triggering in near first second of second minute of third hour of first, fifth and last days of may with timezone UTC+01:00
+ * * "1 2 3 F,4,L 5 60o 0-2w" for triggering in near first second of second minute of third hour of first, fifth and last days of may in case if it will be in Sunday-Tuesday week days with timezone UTC+01:00
+ * * "1 2 3 F,4,L 5 2021" for triggering in near first second of second minute of third hour of first, fifth and last days of may of 2021st year
+ * * "1 2 3 F,4,L 5 2021 60o" for triggering in near first second of second minute of third hour of first, fifth and last days of may of 2021st year with timezone UTC+01:00
+ * * "1 2 3 F,4,L 5 2021 60o 0-2w" for triggering in near first second of second minute of third hour of first, fifth and last days of may of 2021st year if it will be in Sunday-Tuesday week days with timezone UTC+01:00
+ * * "1 2 3 F,4,L 5 2021 60o 0-2w 500ms" for triggering in near first second of second minute of third hour of first, fifth and last days of may of 2021st year if it will be in Sunday-Tuesday week days with timezone UTC+01:00 when milliseconds will be equal to 500
+ *
+ * @return In case when offset parameter is absent in [incoming] will be used [createSimpleScheduler] method and
+ * returned [CronDateTimeScheduler]. In case when offset parameter there is in [incoming] [KrontabTemplate] will be used
+ * [createKronSchedulerWithOffset] and returned [CronDateTimeSchedulerTz]
+ *
+ * @see dev.inmo.krontab.internal.createKronScheduler
+ * @see KrontabConfig.scheduler
+ */
+fun createSimpleScheduler(
+    incoming: KrontabTemplate
+): KronScheduler = KrontabConfig(incoming).scheduler()
+
+fun createSimpleScheduler(
+    incoming: KrontabTemplate,
+    defaultOffset: Minutes
+): KronSchedulerTz = KrontabConfig(incoming).scheduler(defaultOffset)
+
+/**
+ * Shortcut for [createSimpleScheduler]
+ */
+fun buildSchedule(incoming: KrontabTemplate): KronScheduler = createSimpleScheduler(incoming)
+/**
+ * Shortcut for [createSimpleScheduler]
+ */
+fun buildSchedule(incoming: KrontabTemplate, defaultOffset: Minutes): KronSchedulerTz = createSimpleScheduler(incoming, defaultOffset)
+
+/**
+ * Shortcut for [buildSchedule]
+ */
+fun KrontabTemplate.toSchedule(): KronScheduler = buildSchedule(this)
+/**
+ * Shortcut for [buildSchedule]
+ */
+fun KrontabTemplate.toSchedule(defaultOffset: Minutes): KronSchedulerTz = buildSchedule(this, defaultOffset)
+
+/**
+ * Shortcut for [buildSchedule]
+ */
+fun KrontabTemplate.toKronScheduler(): KronScheduler = buildSchedule(this)
+/**
+ * Shortcut for [buildSchedule]
+ */
+fun KrontabTemplate.toKronScheduler(defaultOffset: Minutes): KronSchedulerTz = buildSchedule(this, defaultOffset)

src/commonMain/kotlin/builder/SchedulerBuilder.kt

@@ -0,0 +1,205 @@
+package dev.inmo.krontab.builder
+
+import korlibs.time.TimezoneOffset
+import korlibs.time.minutes
+import dev.inmo.krontab.KronScheduler
+import dev.inmo.krontab.KronSchedulerTz
+import dev.inmo.krontab.internal.*
+import dev.inmo.krontab.internal.createKronScheduler
+import dev.inmo.krontab.internal.createKronSchedulerWithOffset
+import dev.inmo.krontab.utils.Minutes
+
+/**
+ * Will help to create an instance of [KronScheduler]
+ *
+ * @see dev.inmo.krontab.createSimpleScheduler
+ */
+inline fun buildSchedule(settingsBlock: SchedulerBuilder.() -> Unit): KronScheduler {
+    val builder = SchedulerBuilder()
+
+    builder.settingsBlock()
+
+    return builder.build()
+}
+
+/**
+ * Will help to create an instance of [KronScheduler]
+ *
+ * @see dev.inmo.krontab.createSimpleScheduler
+ */
+inline fun buildSchedule(
+    offset: Minutes,
+    settingsBlock: SchedulerBuilder.() -> Unit
+): KronSchedulerTz {
+    val builder = SchedulerBuilder(offset = offset)
+
+    builder.settingsBlock()
+
+    return builder.build() as KronSchedulerTz
+}
+
+/**
+ * Creates new [KronScheduler] with [settingsBlock]
+ *
+ * Since it is inline function, you may break execution of [settingsBlock]
+ * at any time
+ */
+inline operator fun KronScheduler.Companion.invoke(
+    offset: Minutes,
+    settingsBlock: SchedulerBuilder.() -> Unit
+): KronSchedulerTz = buildSchedule(offset, settingsBlock)
+
+/**
+ * Creates new [KronScheduler] with [settingsBlock]
+ *
+ * Since it is inline function, you may break execution of [settingsBlock]
+ * at any time
+ */
+inline operator fun KronScheduler.Companion.invoke(
+    settingsBlock: SchedulerBuilder.() -> Unit
+): KronScheduler = buildSchedule(settingsBlock)
+
+class SchedulerBuilder(
+    private var seconds: Array<Byte>? = null,
+    private var minutes: Array<Byte>? = null,
+    private var hours: Array<Byte>? = null,
+    private var dayOfMonth: Array<Byte>? = null,
+    private var month: Array<Byte>? = null,
+    private var year: Array<Int>? = null,
+    private var dayOfWeek: Array<Byte>? = null,
+    private val offset: Minutes? = null,
+    private var milliseconds: Array<Short>? = null
+) {
+    private fun <I, T : TimeBuilder<I>> callAndReturn(
+        initial: Array<I>?,
+        builder: T,
+        block: T.() -> Unit
+    ): List<I>? {
+        builder.block()
+
+        val builderValue = builder.build()
+
+        return initial ?.let {
+            builderValue ?.let { _ ->
+                (it + builderValue).distinct()
+            } ?: builderValue
+        } ?: builderValue
+    }
+
+    /**
+     * Starts an milliseconds block
+     */
+    fun milliseconds(block: MillisecondsBuilder.() -> Unit) {
+        milliseconds = callAndReturn(
+            milliseconds,
+            MillisecondsBuilder(),
+            block
+        ) ?.toTypedArray()
+    }
+
+    /**
+     * Starts an seconds block
+     */
+    fun seconds(block: SecondsBuilder.() -> Unit) {
+        seconds = callAndReturn(
+            seconds,
+            SecondsBuilder(),
+            block
+        ) ?.toTypedArray()
+    }
+
+    /**
+     * Starts an minutes block
+     */
+    fun minutes(block: MinutesBuilder.() -> Unit) {
+        minutes = callAndReturn(
+            minutes,
+            MinutesBuilder(),
+            block
+        ) ?.toTypedArray()
+    }
+
+    /**
+     * Starts an hours block
+     */
+    fun hours(block: HoursBuilder.() -> Unit) {
+        hours = callAndReturn(
+            hours,
+            HoursBuilder(),
+            block
+        ) ?.toTypedArray()
+    }
+
+    /**
+     * Starts an days of month block
+     */
+    fun dayOfMonth(block: DaysOfMonthBuilder.() -> Unit) {
+        dayOfMonth = callAndReturn(
+            dayOfMonth,
+            DaysOfMonthBuilder(),
+            block
+        ) ?.toTypedArray()
+    }
+
+    /**
+     * Starts an hours block
+     */
+    fun dayOfWeek(block: WeekDaysBuilder.() -> Unit) {
+        dayOfWeek = callAndReturn(
+            dayOfWeek,
+            WeekDaysBuilder(),
+            block
+        ) ?.toTypedArray()
+    }
+
+    /**
+     * Starts an months block
+     */
+    fun months(block: MonthsBuilder.() -> Unit) {
+        month = callAndReturn(
+            month,
+            MonthsBuilder(),
+            block
+        ) ?.toTypedArray()
+    }
+
+    /**
+     * Starts an year block
+     */
+    fun years(block: YearsBuilder.() -> Unit) {
+        year = callAndReturn(
+            year,
+            YearsBuilder(),
+            block
+        ) ?.toTypedArray()
+    }
+
+    /**
+     * @return Completely built and independent [KronScheduler]
+     *
+     * @see dev.inmo.krontab.createSimpleScheduler
+     * @see dev.inmo.krontab.internal.createKronScheduler
+     */
+    fun build(): KronScheduler = offset ?.let {
+        createKronSchedulerWithOffset(
+            seconds = seconds,
+            minutes = minutes,
+            hours = hours,
+            dayOfMonth = dayOfMonth,
+            month = month,
+            years = year,
+            weekDays = dayOfWeek,
+            offset = TimezoneOffset(it.minutes),
+            milliseconds = milliseconds ?: millisecondsArrayDefault
+        )
+    } ?: createKronScheduler(
+        seconds = seconds,
+        minutes = minutes,
+        hours = hours,
+        dayOfMonth = dayOfMonth,
+        month = month,
+        years = year,
+        weekDays = dayOfWeek,
+        milliseconds = milliseconds ?: millisecondsArrayDefault
+    )
+}

src/commonMain/kotlin/builder/TimeBuilder.kt

@@ -1,17 +1,28 @@
-package com.insanusmokrassar.krontab.builder
+package dev.inmo.krontab.builder
 
-import com.insanusmokrassar.krontab.internal.*
+import dev.inmo.krontab.internal.*
-import com.insanusmokrassar.krontab.utils.clamp
 
 /**
  * This class was created for incapsulation of builder work with specified [restrictionsRange]. For example,
- * [include] function of [TimeBuilder] will always [clamp] incoming data using its [restrictionsRange]
+ * [include] function of [TimeBuilder] will always [coerceIn] incoming data using its [restrictionsRange]
  */
-sealed class TimeBuilder (
+sealed class TimeBuilder<T : Number> (
-    private val restrictionsRange: IntRange
+    private val restrictionsRange: IntRange,
+    private val converter: Converter<T>
 ) {
     private var result: Set<Int>? = null
 
+    /**
+     * The first possible value of builder
+     */
+    val first
+        get() = restrictionsRange.first
+    /**
+     * The last possible value of builder. Using of this variable equal to using "L" in strings
+     */
+    val last
+        get() = restrictionsRange.last
+
     /**
      * After calling of this function this builder will allow any value of current time
      */
@@ -25,7 +36,7 @@ sealed class TimeBuilder (
      */
     @Suppress("MemberVisibilityCanBePrivate")
     infix fun include(array: Array<Int>) {
-        val clamped = array.map { it.clamp(restrictionsRange) } + (result ?: emptySet())
+        val clamped = array.map { it.coerceIn(restrictionsRange) } + (result ?: emptySet())
         result = clamped.toSet()
     }
 
@@ -34,9 +45,16 @@ sealed class TimeBuilder (
      */
     @Suppress("unused")
     infix fun at(value: Int) {
-        result = (result ?: emptySet()) + value.clamp(restrictionsRange)
+        result = (result ?: emptySet()) + value.coerceIn(restrictionsRange)
     }
 
+
+    /**
+     * Shortcut for [at]. In fact will
+     */
+    @Suppress("unused", "NOTHING_TO_INLINE")
+    inline infix fun each(value: Int) = at(value)
+
     /**
      * Just wrapper for more obvious writing something like "[from] 2 [every] 5". For example, for [SecondsBuilder] it
      * will mean "[from] second second [every] 5 seconds", or "2, 7, 13, ..."
@@ -51,7 +69,7 @@ sealed class TimeBuilder (
      * @see [from]
      */
     infix fun Int.every(delay: Int): Array<Int> {
-        val progression = clamp(restrictionsRange) .. restrictionsRange.last step delay
+        val progression = coerceIn(restrictionsRange) .. restrictionsRange.last step delay
         val result = progression.toSet().toTypedArray()
 
         this@TimeBuilder include result
@@ -69,7 +87,7 @@ sealed class TimeBuilder (
      */
     @Suppress("MemberVisibilityCanBePrivate")
     infix fun Int.upTo(endIncluding: Int): Array<Int> {
-        val progression = clamp(restrictionsRange) .. endIncluding.clamp(restrictionsRange)
+        val progression = coerceIn(restrictionsRange) .. endIncluding.coerceIn(restrictionsRange)
         val result = progression.toSet().toTypedArray()
 
         this@TimeBuilder include result
@@ -92,11 +110,23 @@ sealed class TimeBuilder (
     @Suppress("MemberVisibilityCanBePrivate")
     infix operator fun rangeTo(endIncluding: Int) = (this from 0) rangeTo endIncluding
 
-    internal fun build() = result ?.map { it.toByte() } ?.toTypedArray()
+    /**
+     * Will include the last possible value
+     */
+    fun includeLast() = at(restrictionsRange.last)
+    /**
+     * Will include the first possible value
+     */
+    fun includeFirst() = at(restrictionsRange.first)
+
+    internal fun build() = result ?.map(converter)
 }
 
-class SecondsBuilder : TimeBuilder(secondsRange)
+class MillisecondsBuilder : TimeBuilder<Short>(millisecondsRange, intToShortConverter)
-class MinutesBuilder : TimeBuilder(minutesRange)
+class SecondsBuilder : TimeBuilder<Byte>(secondsRange, intToByteConverter)
-class HoursBuilder : TimeBuilder(hoursRange)
+class MinutesBuilder : TimeBuilder<Byte>(minutesRange, intToByteConverter)
-class DaysOfMonthBuilder : TimeBuilder(dayOfMonthRange)
+class HoursBuilder : TimeBuilder<Byte>(hoursRange, intToByteConverter)
-class MonthsBuilder : TimeBuilder(monthRange)
+class DaysOfMonthBuilder : TimeBuilder<Byte>(dayOfMonthRange, intToByteConverter)
+class MonthsBuilder : TimeBuilder<Byte>(monthRange, intToByteConverter)
+class YearsBuilder : TimeBuilder<Int>(yearRange, intToIntConverter)
+class WeekDaysBuilder : TimeBuilder<Byte>(dayOfWeekRange, intToByteConverter)

src/commonMain/kotlin/collection/CollectionFunctions.kt

@@ -0,0 +1,25 @@
+package dev.inmo.krontab.collection
+
+import dev.inmo.krontab.KronScheduler
+
+@Suppress("NOTHING_TO_INLINE")
+inline fun CollectionKronScheduler.includeAll(kronSchedulers: List<KronScheduler>) {
+    kronSchedulers.forEach {
+        include(it)
+    }
+}
+
+@Suppress("NOTHING_TO_INLINE")
+inline fun CollectionKronScheduler.includeAll(vararg kronSchedulers: KronScheduler) {
+    includeAll(kronSchedulers.toList())
+}
+
+operator fun KronScheduler.plus(kronScheduler: KronScheduler): CollectionKronScheduler {
+    return CollectionKronScheduler().apply {
+        includeAll(this, kronScheduler)
+    }
+}
+
+operator fun CollectionKronScheduler.plusAssign(kronScheduler: KronScheduler) {
+    include(kronScheduler)
+}

src/commonMain/kotlin/collection/CollectionKronScheduler.kt

@@ -0,0 +1,66 @@
+package dev.inmo.krontab.collection
+
+import korlibs.time.DateTime
+import korlibs.time.DateTimeTz
+import dev.inmo.krontab.*
+import dev.inmo.krontab.internal.*
+
+/**
+ * This scheduler will be useful in case you want to unite several different [KronScheduler]s
+ */
+data class CollectionKronScheduler internal constructor(
+    internal val schedulers: MutableList<KronScheduler>
+) : KronSchedulerTz {
+    internal constructor() : this(mutableListOf())
+
+    /**
+     * Add [kronScheduler] into its [schedulers] list
+     *
+     * * When [kronScheduler] is [CronDateTimeScheduler] it will merge all [CronDateTimeScheduler]s from [schedulers] list
+     * and this [kronScheduler] using [mergeCronDateTimeSchedulers] function
+     * * When [kronScheduler] is [CollectionKronScheduler] it this instance will include all [kronScheduler]
+     * [schedulers]
+     * * Otherwise [kronScheduler] will be added to [schedulers] list
+     */
+    fun include(kronScheduler: KronScheduler) {
+        when (kronScheduler) {
+            is CronDateTimeScheduler -> {
+                val resultCronDateTimes = mutableListOf(kronScheduler)
+                schedulers.removeAll {
+                    if (it is CronDateTimeScheduler) {
+                        resultCronDateTimes.add(it)
+                    } else {
+                        false
+                    }
+                }
+                schedulers.add(
+                    mergeCronDateTimeSchedulers(resultCronDateTimes)
+                )
+            }
+            is CronDateTimeSchedulerTz -> {
+                val newCronDateTimes = mutableListOf(kronScheduler.cronDateTime)
+                schedulers.removeAll {
+                    if (it is CronDateTimeSchedulerTz && it.offset == kronScheduler.offset) {
+                        newCronDateTimes.add(it.cronDateTime)
+                        true
+                    } else {
+                        false
+                    }
+                }
+                schedulers.add(CronDateTimeSchedulerTz(newCronDateTimes.merge(), kronScheduler.offset))
+            }
+            is CollectionKronScheduler -> kronScheduler.schedulers.forEach {
+                include(it)
+            }
+            else -> schedulers.add(kronScheduler)
+        }
+    }
+
+    override suspend fun next(relatively: DateTime): DateTime {
+        return schedulers.mapNotNull { it.next(relatively) }.minOrNull() ?: getAnyNext(relatively)
+    }
+
+    override suspend fun next(relatively: DateTimeTz): DateTimeTz {
+        return schedulers.mapNotNull { it.next(relatively) }.minOrNull() ?: getAnyNext(relatively.local).toOffsetUnadjusted(relatively.offset)
+    }
+}

src/commonMain/kotlin/com/insanusmokrassar/krontab/Executes.kt

@@ -1,58 +0,0 @@
-package com.insanusmokrassar.krontab
-
-import com.soywiz.klock.DateTime
-import kotlinx.coroutines.Deferred
-import kotlinx.coroutines.delay
-
-/**
- * Execute [block] once at the [KronScheduler.next] time and return result of [block] calculation.
- *
- * WARNING!!! If you want to launch it in parallel, you must do this explicitly.
- */
-suspend inline fun <T> KronScheduler.doOnce(noinline block: suspend () -> T): T {
-    delay((next() - DateTime.now()).millisecondsLong)
-    return block()
-}
-
-/**
- * Will [buildSchedule] using [scheduleConfig] and call [doOnce] on it
- * @see buildSchedule
- */
-suspend inline fun <T> doOnce(
-    scheduleConfig: String,
-    noinline block: suspend () -> T
-) = buildSchedule(scheduleConfig).doOnce(block)
-
-/**
- * Will execute [block] while it will return true as a result of its calculation
- */
-suspend inline fun KronScheduler.doWhile(noinline block: suspend () -> Boolean) {
-    do { val doNext = doOnce(block) } while (doNext)
-}
-
-/**
- * Will [buildSchedule] using [scheduleConfig] and call [doWhile] with [block]
- *
- * @see buildSchedule
- */
-suspend inline fun doWhile(
-    scheduleConfig: String,
-    noinline block: suspend () -> Boolean
-) = buildSchedule(scheduleConfig).doWhile(block)
-
-/**
- * Will execute [block] without any checking of result
- */
-suspend inline fun KronScheduler.doInfinity(noinline block: suspend () -> Unit) = doWhile {
-    block()
-    true
-}
-/**
- * Will [buildSchedule] using [scheduleConfig] and call [doInfinity] with [block]
- *
- * @see buildSchedule
- */
-suspend inline fun doInfinity(
-    scheduleConfig: String,
-    noinline block: suspend () -> Unit
-) = buildSchedule(scheduleConfig).doInfinity(block)

src/commonMain/kotlin/com/insanusmokrassar/krontab/KronScheduler.kt

@@ -1,21 +0,0 @@
-package com.insanusmokrassar.krontab
-
-import com.soywiz.klock.DateTime
-
-/**
- * This interface was created for abstraction of [next] operation. Currently, there is only
- * [com.insanusmokrassar.krontab.internal.CronDateTimeScheduler] realisation of this interface inside of this library,
- * but you it is possible to create your own realisation of this interface for scheduling, for example, depending of
- * users activity or something like this
- *
- * @see com.insanusmokrassar.krontab.internal.CronDateTimeScheduler
- */
-interface KronScheduler {
-
-    /**
-     * @return Next [DateTime] when some action must be triggered according to settings of this instance
-     *
-     * @see com.insanusmokrassar.krontab.internal.CronDateTimeScheduler.next
-     */
-    suspend fun next(relatively: DateTime = DateTime.now()): DateTime
-}

src/commonMain/kotlin/com/insanusmokrassar/krontab/SchedulerShortcuts.kt

@@ -1,51 +0,0 @@
-package com.insanusmokrassar.krontab
-
-import com.insanusmokrassar.krontab.builder.buildSchedule
-import com.insanusmokrassar.krontab.internal.CronDateTime
-import com.insanusmokrassar.krontab.internal.CronDateTimeScheduler
-
-internal val anyCronDateTime by lazy {
-    CronDateTime()
-}
-
-/**
- * [KronScheduler.next] will always return [com.soywiz.klock.DateTime.now]
- */
-val AnyTimeScheduler: KronScheduler by lazy {
-    CronDateTimeScheduler(listOf(anyCronDateTime))
-}
-
-/**
- * [KronScheduler.next] will always return [com.soywiz.klock.DateTime.now] + one second
- */
-val EverySecondScheduler: KronScheduler by lazy {
-    buildSchedule { seconds { 0 every 1 } }
-}
-
-/**
- * [KronScheduler.next] will always return [com.soywiz.klock.DateTime.now] + one minute
- */
-val EveryMinuteScheduler: KronScheduler by lazy {
-    buildSchedule { minutes { 0 every 1 } }
-}
-
-/**
- * [KronScheduler.next] will always return [com.soywiz.klock.DateTime.now] + one hour
- */
-val EveryHourScheduler: KronScheduler by lazy {
-    buildSchedule { hours { 0 every 1 } }
-}
-
-/**
- * [KronScheduler.next] will always return [com.soywiz.klock.DateTime.now] + one day
- */
-val EveryDayOfMonthScheduler: KronScheduler by lazy {
-    buildSchedule { dayOfMonth { 0 every 1 } }
-}
-
-/**
- * [KronScheduler.next] will always return [com.soywiz.klock.DateTime.now] + one month
- */
-val EveryMonthScheduler: KronScheduler by lazy {
-    buildSchedule { months { 0 every 1 } }
-}

src/commonMain/kotlin/com/insanusmokrassar/krontab/StringParser.kt

@@ -1,69 +0,0 @@
-package com.insanusmokrassar.krontab
-
-import com.insanusmokrassar.krontab.internal.*
-
-/**
- * @see createSimpleScheduler
- * @see buildSchedule
- */
-typealias KrontabTemplate = String
-
-/**
- * Parse [incoming] string and adapt according to next format: "* * * * *" where order of things:
- *
- * * seconds
- * * minutes
- * * hours
- * * dayOfMonth
- * * month
- *
- * And each one have next format:
- *
- * `{number}[,{number},...]` or `*`
- *
- * and {number} here is one of
- *
- * * {int}-{int}
- * * {int}/{int}
- * * */{int}
- * * {int}
- *
- * Additional info about ranges can be found in follow accordance:
- *
- * * Seconds ranges can be found in [secondsRange]
- * * Minutes ranges can be found in [minutesRange]
- * * Hours ranges can be found in [hoursRange]
- * * Days of month ranges can be found in [dayOfMonthRange]
- * * Months ranges can be found in [monthRange]
- *
- * Examples:
- *
- * * "0/5 * * * *" for every five seconds triggering
- * * "0/15 30 * * *" for every 15th seconds in a half of each hour
- * * "1 2 3 4 5" for triggering in near first second of second minute of third hour of fourth day of may
- *
- * @see com.insanusmokrassar.krontab.internal.createKronScheduler
- */
-fun createSimpleScheduler(incoming: KrontabTemplate): KronScheduler {
-    val (secondsSource, minutesSource, hoursSource, dayOfMonthSource, monthSource) = incoming.split(" ")
-
-    val secondsParsed = parseSeconds(secondsSource)
-    val minutesParsed = parseMinutes(minutesSource)
-    val hoursParsed = parseHours(hoursSource)
-    val dayOfMonthParsed = parseDaysOfMonth(dayOfMonthSource)
-    val monthParsed = parseMonths(monthSource)
-
-    return createKronScheduler(
-        secondsParsed, minutesParsed, hoursParsed, dayOfMonthParsed, monthParsed
-    )
-}
-
-/**
- * Shortcut for [createSimpleScheduler]
- */
-fun buildSchedule(incoming: KrontabTemplate): KronScheduler = createSimpleScheduler(incoming)
-
-/**
- * Shortcut for [buildSchedule]
- */
-fun KrontabTemplate.toSchedule(): KronScheduler = buildSchedule(this)

src/commonMain/kotlin/com/insanusmokrassar/krontab/builder/SchedulerBuilder.kt

@@ -1,107 +0,0 @@
-package com.insanusmokrassar.krontab.builder
-
-import com.insanusmokrassar.krontab.KronScheduler
-import com.insanusmokrassar.krontab.internal.*
-import com.insanusmokrassar.krontab.internal.CronDateTime
-import com.insanusmokrassar.krontab.internal.CronDateTimeScheduler
-import com.insanusmokrassar.krontab.internal.fillWith
-
-/**
- * Will help to create an instance of [KronScheduler]
- *
- * @see com.insanusmokrassar.krontab.createSimpleScheduler
- */
-fun buildSchedule(settingsBlock: SchedulerBuilder.() -> Unit): KronScheduler {
-    val builder = SchedulerBuilder()
-
-    builder.settingsBlock()
-
-    return builder.build()
-}
-
-class SchedulerBuilder(
-    private var seconds: Array<Byte>? = null,
-    private var minutes: Array<Byte>? = null,
-    private var hours: Array<Byte>? = null,
-    private var dayOfMonth: Array<Byte>? = null,
-    private var month: Array<Byte>? = null
-) {
-    private fun <T : TimeBuilder> callAndReturn(
-        initial: Array<Byte>?,
-        builder: T,
-        block: T.() -> Unit
-    ): Array<Byte>? {
-        builder.block()
-
-        val builderValue = builder.build()
-
-        return initial ?.let {
-            builderValue ?.let { _ ->
-                (it + builderValue).distinct().toTypedArray()
-            } ?: builderValue
-        } ?: builderValue
-    }
-
-    /**
-     * Starts an seconds block
-     */
-    fun seconds(block: SecondsBuilder.() -> Unit) {
-        seconds = callAndReturn(
-            seconds,
-            SecondsBuilder(),
-            block
-        )
-    }
-
-    /**
-     * Starts an minutes block
-     */
-    fun minutes(block: MinutesBuilder.() -> Unit) {
-        minutes = callAndReturn(
-            minutes,
-            MinutesBuilder(),
-            block
-        )
-    }
-
-    /**
-     * Starts an hours block
-     */
-    fun hours(block: HoursBuilder.() -> Unit) {
-        hours = callAndReturn(
-            hours,
-            HoursBuilder(),
-            block
-        )
-    }
-
-    /**
-     * Starts an days of month block
-     */
-    fun dayOfMonth(block: DaysOfMonthBuilder.() -> Unit) {
-        dayOfMonth = callAndReturn(
-            dayOfMonth,
-            DaysOfMonthBuilder(),
-            block
-        )
-    }
-
-    /**
-     * Starts an months block
-     */
-    fun months(block: MonthsBuilder.() -> Unit) {
-        month = callAndReturn(
-            month,
-            MonthsBuilder(),
-            block
-        )
-    }
-
-    /**
-     * @return Completely built and independent [KronScheduler]
-     *
-     * @see com.insanusmokrassar.krontab.createSimpleScheduler
-     * @see com.insanusmokrassar.krontab.internal.createKronScheduler
-     */
-    fun build(): KronScheduler = createKronScheduler(seconds, minutes, hours, dayOfMonth, month)
-}

src/commonMain/kotlin/com/insanusmokrassar/krontab/internal/CronDateTime.kt

@@ -1,100 +0,0 @@
-package com.insanusmokrassar.krontab.internal
-
-import com.insanusmokrassar.krontab.KronScheduler
-import com.insanusmokrassar.krontab.utils.clamp
-import com.soywiz.klock.DateTime
-import com.soywiz.klock.DateTimeSpan
-
-/**
- * @param month 0-11
- * @param dayOfMonth 0-31
- * @param hours 0-23
- * @param minutes 0-59
- * @param seconds 0-59
- */
-internal data class CronDateTime(
-    val month: Byte? = null,
-    val dayOfMonth: Byte? = null,
-    val hours: Byte? = null,
-    val minutes: Byte? = null,
-    val seconds: Byte? = null
-) {
-    init {
-        check(month ?.let { it in monthRange } ?: true)
-        check(dayOfMonth ?.let { it in dayOfMonthRange } ?: true)
-        check(hours?.let { it in hoursRange } ?: true)
-        check(minutes?.let { it in minutesRange } ?: true)
-        check(seconds?.let { it in secondsRange } ?: true)
-    }
-
-    internal val klockDayOfMonth = dayOfMonth ?.plus(1)
-}
-
-/**
- * @return The near [DateTime] which happens after [relativelyTo] or will be equal to [relativelyTo]
- */
-internal fun CronDateTime.toNearDateTime(relativelyTo: DateTime = DateTime.now()): DateTime {
-    var current = relativelyTo
-
-    seconds?.let {
-        val left = it - current.seconds
-        current += DateTimeSpan(minutes = if (left <= 0) 1 else 0, seconds = left)
-    }
-
-    minutes?.let {
-        val left = it - current.minutes
-        current += DateTimeSpan(hours = if (left < 0) 1 else 0, minutes = left)
-    }
-
-    hours?.let {
-        val left = it - current.hours
-        current += DateTimeSpan(days = if (left < 0) 1 else 0, hours = left)
-    }
-
-    klockDayOfMonth ?.let {
-        val left = it - current.dayOfMonth
-        current += DateTimeSpan(months = if (left < 0) 1 else 0, days = left)
-    }
-
-    month ?.let {
-        val left = it - current.month0
-        current += DateTimeSpan(months = if (left < 0) 1 else 0, days = left)
-    }
-
-    return current
-}
-
-/**
- * @return [KronScheduler] (in fact [CronDateTimeScheduler]) based on incoming data
- */
-internal fun createKronScheduler(
-    seconds: Array<Byte>? = null,
-    minutes: Array<Byte>? = null,
-    hours: Array<Byte>? = null,
-    dayOfMonth: Array<Byte>? = null,
-    month: Array<Byte>? = null
-): KronScheduler {
-    val resultCronDateTimes = mutableListOf(CronDateTime())
-
-    seconds ?.fillWith(resultCronDateTimes) { previousCronDateTime: CronDateTime, currentTime: Byte ->
-        previousCronDateTime.copy(seconds = currentTime)
-    }
-
-    minutes ?.fillWith(resultCronDateTimes) { previousCronDateTime: CronDateTime, currentTime: Byte ->
-        previousCronDateTime.copy(minutes = currentTime)
-    }
-
-    hours ?.fillWith(resultCronDateTimes) { previousCronDateTime: CronDateTime, currentTime: Byte ->
-        previousCronDateTime.copy(hours = currentTime)
-    }
-
-    dayOfMonth ?.fillWith(resultCronDateTimes) { previousCronDateTime: CronDateTime, currentTime: Byte ->
-        previousCronDateTime.copy(dayOfMonth = currentTime)
-    }
-
-    month ?.fillWith(resultCronDateTimes) { previousCronDateTime: CronDateTime, currentTime: Byte ->
-        previousCronDateTime.copy(month = currentTime)
-    }
-
-    return CronDateTimeScheduler(resultCronDateTimes.toList())
-}

src/commonMain/kotlin/com/insanusmokrassar/krontab/internal/CronDateTimeScheduler.kt

@@ -1,32 +0,0 @@
-package com.insanusmokrassar.krontab.internal
-
-import com.insanusmokrassar.krontab.KronScheduler
-import com.insanusmokrassar.krontab.anyCronDateTime
-import com.soywiz.klock.DateTime
-
-/**
- * Cron-oriented realisation of [KronScheduler]
- *
- * @see com.insanusmokrassar.krontab.AnyTimeScheduler
- * @see com.insanusmokrassar.krontab.EverySecondScheduler
- * @see com.insanusmokrassar.krontab.EveryMinuteScheduler
- * @see com.insanusmokrassar.krontab.EveryHourScheduler
- * @see com.insanusmokrassar.krontab.EveryDayOfMonthScheduler
- * @see com.insanusmokrassar.krontab.EveryMonthScheduler
- *
- * @see com.insanusmokrassar.krontab.builder.buildSchedule
- * @see com.insanusmokrassar.krontab.builder.SchedulerBuilder
- */
-internal data class CronDateTimeScheduler internal constructor(
-    internal val cronDateTimes: List<CronDateTime>
-) : KronScheduler {
-    /**
-     * @return Near date using [cronDateTimes] list and getting the [Iterable.min] one
-     *
-     * @see toNearDateTime
-     */
-    override suspend fun next(relatively: DateTime): DateTime {
-        return cronDateTimes.map { it.toNearDateTime(relatively) }.minOrNull() ?: anyCronDateTime.toNearDateTime(relatively)
-    }
-}
-

src/commonMain/kotlin/com/insanusmokrassar/krontab/internal/Parser.kt

@@ -1,52 +0,0 @@
-package com.insanusmokrassar.krontab.internal
-
-import com.insanusmokrassar.krontab.utils.clamp
-
-private fun createSimpleScheduler(from: String, dataRange: IntRange): Array<Byte>? {
-    val things = from.split(",")
-
-    val results = things.flatMap {
-        when {
-            it.contains("-") -> {
-                val splitted = it.split("-")
-                (splitted.first().toInt().clamp(dataRange) .. splitted[1].toInt().clamp(dataRange)).toList()
-            }
-            it.contains("/") -> {
-                val (start, step) = it.split("/")
-                val startNum = (if (start.isEmpty() || start == "*") {
-                    0
-                } else {
-                    start.toInt()
-                }).clamp(dataRange)
-                val stepNum = step.toInt().clamp(dataRange)
-                (startNum .. dataRange.last step stepNum).map { it }
-            }
-            it == "*" -> return null
-            else -> listOf(it.toInt().clamp(dataRange))
-        }
-    }
-
-    return results.map { it.toByte() }.toTypedArray()
-}
-
-internal fun parseMonths(from: String) = createSimpleScheduler(from, monthRange)
-internal fun parseDaysOfMonth(from: String) = createSimpleScheduler(from, dayOfMonthRange)
-internal fun parseHours(from: String) = createSimpleScheduler(from, hoursRange)
-internal fun parseMinutes(from: String) = createSimpleScheduler(from, minutesRange)
-internal fun parseSeconds(from: String) = createSimpleScheduler(from, secondsRange)
-
-internal fun Array<Byte>.fillWith(
-    whereToPut: MutableList<CronDateTime>,
-    createFactory: (CronDateTime, Byte) -> CronDateTime
-) {
-    val previousValues = whereToPut.toList()
-
-    whereToPut.clear()
-
-    previousValues.forEach { previousValue ->
-        forEach {
-            whereToPut.add(createFactory(previousValue, it))
-        }
-    }
-}
-

src/commonMain/kotlin/com/insanusmokrassar/krontab/utils/Data.kt

@@ -1,12 +0,0 @@
-package com.insanusmokrassar.krontab.utils
-
-/**
- * @return [min] in case if [this] less than [min]. Otherwise will check that [max] grant than [this] and return [this]
- * if so or [max] otherwise
- */
-internal fun Int.clamp(min: Int, max: Int): Int = if (this < min) min else if (this > max) max else this
-
-/**
- * Wrapper function for [clamp] extension
- */
-internal fun Int.clamp(range: IntRange): Int = clamp(range.first, range.last)

src/commonMain/kotlin/com/insanusmokrassar/krontab/utils/SchedulerFlow.kt

@@ -1,26 +0,0 @@
-package com.insanusmokrassar.krontab.utils
-
-import com.insanusmokrassar.krontab.KronScheduler
-import com.soywiz.klock.DateTime
-import kotlinx.coroutines.FlowPreview
-import kotlinx.coroutines.delay
-import kotlinx.coroutines.flow.*
-
-@FlowPreview
-fun KronScheduler.asFlow(): Flow<DateTime> = SchedulerFlow(this)
-
-@FlowPreview
-class SchedulerFlow(
-    private val scheduler: KronScheduler
-) : AbstractFlow<DateTime>() {
-    @FlowPreview
-    override suspend fun collectSafely(collector: FlowCollector<DateTime>) {
-        while (true) {
-            val now = DateTime.now()
-            val nextTime = scheduler.next(now)
-            val sleepDelay = (nextTime - now).millisecondsLong
-            delay(sleepDelay)
-            collector.emit(nextTime)
-        }
-    }
-}

src/commonMain/kotlin/internal/CronDateTime.kt

@@ -0,0 +1,136 @@
+package dev.inmo.krontab.internal
+
+import korlibs.time.DateTime
+import korlibs.time.TimezoneOffset
+import dev.inmo.krontab.KronScheduler
+
+/**
+ * @param daysOfWeek 0-6
+ * @param years any int
+ * @param months 0-11
+ * @param daysOfMonth 0-30
+ * @param hours 0-23
+ * @param minutes 0-59
+ * @param seconds 0-59
+ */
+internal data class CronDateTime(
+    val daysOfWeek: Array<Byte>? = null,
+    val years: Array<Int>? = null,
+    val months: Array<Byte>? = null,
+    val daysOfMonth: Array<Byte>? = null,
+    val hours: Array<Byte>? = null,
+    val minutes: Array<Byte>? = null,
+    val seconds: Array<Byte>? = null,
+    val milliseconds: Array<Short>? = millisecondsArrayDefault
+) {
+    init {
+        check(daysOfWeek ?.all { it in dayOfWeekRange } ?: true)
+        check(years?.all { it in yearRange } ?: true)
+        check(months?.all { it in monthRange } ?: true)
+        check(daysOfMonth ?.all { it in dayOfMonthRange } ?: true)
+        check(hours?.all { it in hoursRange } ?: true)
+        check(minutes?.all { it in minutesRange } ?: true)
+        check(seconds?.all { it in secondsRange } ?: true)
+        check(milliseconds?.all { it in millisecondsRange } ?: true)
+    }
+
+    internal val calculators = listOf(
+        years ?.let { NearDateTimeCalculatorYears(it) },
+        daysOfWeek ?.let { NearDateTimeCalculatorWeekDays(it) },
+        milliseconds ?.let { NearDateTimeCalculatorMillis(it) },
+        seconds ?.let { NearDateTimeCalculatorSeconds(it) },
+        minutes ?.let { NearDateTimeCalculatorMinutes(it) },
+        hours ?.let { NearDateTimeCalculatorHours(it) },
+        daysOfMonth ?.let { NearDateTimeCalculatorDays(it) },
+        months ?.let { NearDateTimeCalculatorMonths(it) },
+    )
+
+    internal fun toNearDateTime(relativelyTo: DateTime = DateTime.now()): DateTime? {
+        var current = relativelyTo
+        whileLoop@while (true) {
+            for (calculator in calculators) {
+                val (calculated, requireRecalculation) = (calculator ?: continue).calculateNearTime(current) ?: return null
+                current = calculated
+                if (requireRecalculation) {
+                    continue@whileLoop
+                }
+            }
+            return current
+        }
+    }
+}
+
+internal fun createCronDateTime(
+    seconds: Array<Byte>? = null,
+    minutes: Array<Byte>? = null,
+    hours: Array<Byte>? = null,
+    dayOfMonth: Array<Byte>? = null,
+    month: Array<Byte>? = null,
+    years: Array<Int>? = null,
+    weekDays: Array<Byte>? = null,
+    milliseconds: Array<Short>? = millisecondsArrayDefault
+): CronDateTime {
+    return CronDateTime(weekDays, years, month, dayOfMonth, hours, minutes, seconds, milliseconds)
+}
+
+/**
+ * @return [KronScheduler] (in fact [CronDateTimeScheduler]) based on incoming data
+ */
+internal fun createKronScheduler(
+    seconds: Array<Byte>? = null,
+    minutes: Array<Byte>? = null,
+    hours: Array<Byte>? = null,
+    dayOfMonth: Array<Byte>? = null,
+    month: Array<Byte>? = null,
+    years: Array<Int>? = null,
+    weekDays: Array<Byte>? = null,
+    milliseconds: Array<Short>? = millisecondsArrayDefault
+): KronScheduler = CronDateTimeScheduler(
+    createCronDateTime(
+        seconds,
+        minutes,
+        hours,
+        dayOfMonth,
+        month,
+        years,
+        weekDays,
+        milliseconds
+    )
+)
+/**
+ * @return [KronScheduler] (in fact [CronDateTimeScheduler]) based on incoming data
+ */
+internal fun createKronSchedulerWithOffset(
+    seconds: Array<Byte>? = null,
+    minutes: Array<Byte>? = null,
+    hours: Array<Byte>? = null,
+    dayOfMonth: Array<Byte>? = null,
+    month: Array<Byte>? = null,
+    years: Array<Int>? = null,
+    weekDays: Array<Byte>? = null,
+    offset: TimezoneOffset,
+    milliseconds: Array<Short>? = millisecondsArrayDefault
+): KronScheduler = CronDateTimeSchedulerTz(
+    createCronDateTime(
+        seconds,
+        minutes,
+        hours,
+        dayOfMonth,
+        month,
+        years,
+        weekDays,
+        milliseconds
+    ),
+    offset
+)
+
+internal fun List<CronDateTime>.merge() = CronDateTime(
+    flatMap { it.daysOfWeek ?.toList() ?: emptyList() }.distinct().toTypedArray().takeIf { it.isNotEmpty() },
+    flatMap { it.years ?.toList() ?: emptyList() }.distinct().toTypedArray().takeIf { it.isNotEmpty() },
+    flatMap { it.months ?.toList() ?: emptyList() }.distinct().toTypedArray().takeIf { it.isNotEmpty() },
+    flatMap { it.daysOfMonth ?.toList() ?: emptyList() }.distinct().toTypedArray().takeIf { it.isNotEmpty() },
+    flatMap { it.hours ?.toList() ?: emptyList() }.distinct().toTypedArray().takeIf { it.isNotEmpty() },
+    flatMap { it.minutes ?.toList() ?: emptyList() }.distinct().toTypedArray().takeIf { it.isNotEmpty() },
+    flatMap { it.seconds ?.toList() ?: emptyList() }.distinct().toTypedArray().takeIf { it.isNotEmpty() },
+    flatMap { it.milliseconds ?.toList() ?: listOf(0) }.distinct().toTypedArray().takeIf { it.isNotEmpty() },
+)

src/commonMain/kotlin/internal/CronDateTimeScheduler.kt

@@ -0,0 +1,38 @@
+package dev.inmo.krontab.internal
+
+import korlibs.time.DateTime
+import dev.inmo.krontab.KronScheduler
+
+/**
+ * Cron-oriented realisation of [KronScheduler]
+ *
+ * @see dev.inmo.krontab.AnyTimeScheduler
+ * @see dev.inmo.krontab.EveryMillisecondScheduler
+ * @see dev.inmo.krontab.EverySecondScheduler
+ * @see dev.inmo.krontab.EveryMinuteScheduler
+ * @see dev.inmo.krontab.EveryHourScheduler
+ * @see dev.inmo.krontab.EveryDayOfMonthScheduler
+ * @see dev.inmo.krontab.EveryMonthScheduler
+ * @see dev.inmo.krontab.EveryYearScheduler
+ *
+ * @see dev.inmo.krontab.builder.buildSchedule
+ * @see dev.inmo.krontab.builder.SchedulerBuilder
+ */
+internal data class CronDateTimeScheduler internal constructor(
+    internal val cronDateTime: CronDateTime
+) : KronScheduler {
+    /**
+     * @return Near date using [cronDateTimes] list and getting the [Iterable.minByOrNull] one
+     *
+     * @see toNearDateTime
+     */
+    override suspend fun next(relatively: DateTime): DateTime? {
+        return cronDateTime.toNearDateTime(relatively)
+    }
+}
+
+internal fun mergeCronDateTimeSchedulers(
+    schedulers: List<CronDateTimeScheduler>
+): CronDateTimeScheduler = CronDateTimeScheduler(
+    schedulers.map { it.cronDateTime }.merge()
+)

src/commonMain/kotlin/internal/CronDateTimeSchedulerTz.kt

@@ -0,0 +1,37 @@
+package dev.inmo.krontab.internal
+
+import korlibs.time.DateTime
+import korlibs.time.DateTimeTz
+import korlibs.time.TimezoneOffset
+import dev.inmo.krontab.KronScheduler
+import dev.inmo.krontab.KronSchedulerTz
+
+/**
+ * Cron-oriented realisation of [KronScheduler] with taking into account [offset] for list of [cronDateTimes]
+ *
+ * @see CronDateTime
+ */
+internal data class CronDateTimeSchedulerTz internal constructor(
+    internal val cronDateTime: CronDateTime,
+    internal val offset: TimezoneOffset
+) : KronSchedulerTz {
+    override suspend fun next(relatively: DateTimeTz): DateTimeTz? {
+        val dateTimeWithActualOffset = relatively.toOffset(offset).local
+        return cronDateTime.toNearDateTime(dateTimeWithActualOffset) ?.toOffsetUnadjusted(offset) ?.toOffset(relatively.offset)
+    }
+
+    override suspend fun next(relatively: DateTime): DateTime? {
+        return next(relatively.toOffset(offset)) ?.utc
+    }
+}
+
+internal fun mergeCronDateTimeSchedulers(
+    schedulers: List<CronDateTimeSchedulerTz>
+) = schedulers.groupBy {
+    it.offset
+}.map { (offset, schedulers) ->
+    CronDateTimeSchedulerTz(
+        schedulers.map { it.cronDateTime }.merge(),
+        offset
+    )
+}

src/commonMain/kotlin/internal/Defaults.kt

@@ -0,0 +1,4 @@
+package dev.inmo.krontab.internal
+
+internal const val millisecondsDefault: Short = 0
+internal val millisecondsArrayDefault: Array<Short> = arrayOf(millisecondsDefault)

src/commonMain/kotlin/internal/NearDateTimeCalculator.kt

@@ -0,0 +1,190 @@
+package dev.inmo.krontab.internal
+
+import korlibs.time.*
+import dev.inmo.krontab.utils.copy
+import kotlin.math.min
+
+fun interface NearDateTimeCalculator {
+    /**
+     * @return pair of near [DateTime] for this checker and [Boolean] flag that all previous calculations must be
+     * recalculated
+     */
+    fun calculateNearTime(
+        relativelyTo: DateTime
+    ): Pair<DateTime, Boolean>?
+}
+
+internal class CommonNearDateTimeCalculator<T>(
+    private val times: Array<T>,
+    private val partGetter: (DateTime) -> T,
+    private val partSetter: (DateTime, T) -> DateTime?
+) : NearDateTimeCalculator where T : Comparable<T>, T : Number {
+    /**
+     * @return pair of near [DateTime] for this checker and [Boolean] flag that all previous calculations must be
+     * recalculated
+     */
+    override fun calculateNearTime(
+        relativelyTo: DateTime
+    ): Pair<DateTime, Boolean>? {
+        val currentData = partGetter(relativelyTo)
+        val greaterOrEquals = times.firstOrNull { it >= currentData }
+        val newDateTime = when (greaterOrEquals) {
+            null -> partSetter(relativelyTo, times.first()) ?: return null
+            currentData -> relativelyTo
+            else -> partSetter(relativelyTo, greaterOrEquals) ?: return null
+        }
+        return if (newDateTime == relativelyTo) {
+            relativelyTo to false
+        } else {
+            newDateTime to true
+        }
+    }
+}
+
+internal fun NearDateTimeCalculatorMillis(
+    times: Array<Short>
+) = CommonNearDateTimeCalculator(
+    times,
+    { it.milliseconds.toShort() },
+    { dateTime, newOne ->
+        (if (newOne < dateTime.milliseconds) {
+            dateTime.plus(1.seconds)
+        } else {
+            dateTime
+        }).copy(milliseconds = newOne.toInt())
+    }
+)
+
+internal fun NearDateTimeCalculatorSeconds(
+    times: Array<Byte>
+) = CommonNearDateTimeCalculator(
+    times,
+    { it.seconds.toByte() },
+    { dateTime, newOne ->
+        (if (newOne < dateTime.seconds) {
+            dateTime.plus(1.minutes)
+        } else {
+            dateTime
+        }).copy(second = newOne.toInt(), milliseconds = 0)
+    }
+)
+
+internal fun NearDateTimeCalculatorMinutes(
+    times: Array<Byte>
+) = CommonNearDateTimeCalculator(
+    times,
+    { it.minutes.toByte() },
+    { dateTime, newOne ->
+        (if (newOne < dateTime.minutes) {
+            dateTime.plus(1.hours)
+        } else {
+            dateTime
+        }).copy(minute = newOne.toInt(), second = 0, milliseconds = 0)
+    }
+)
+
+internal fun NearDateTimeCalculatorHours(
+    times: Array<Byte>
+) = CommonNearDateTimeCalculator(
+    times,
+    { it.hours.toByte() },
+    { dateTime, newOne ->
+        (if (newOne < dateTime.hours) {
+            dateTime.plus(1.days)
+        } else {
+            dateTime
+        }).copy(hour = newOne.toInt(), minute = 0, second = 0, milliseconds = 0)
+    }
+)
+
+internal fun NearDateTimeCalculatorDays(
+    times: Array<Byte>
+) = CommonNearDateTimeCalculator(
+    times,
+    { (it.dayOfMonth - 1).toByte() }, // index1, so, decrease
+    { dateTime, newOne ->
+        val dateTime = (if (newOne < dateTime.dayOfMonth) {
+            dateTime.plus(1.months)
+        } else {
+            dateTime
+        })
+        val newDateTime = dateTime.copy(
+            dayOfMonth = min(dateTime.month.days(dateTime.year), newOne.toInt() + 1), // index1
+            hour = 0,
+            minute = 0,
+            second = 0,
+            milliseconds = 0
+        )
+        // If day of month has not been changed, use old dateTime due to no changes required
+        if (newDateTime.dayOfMonth == dateTime.dayOfMonth) {
+            dateTime
+        } else {
+            newDateTime
+        }
+    }
+)
+
+internal fun NearDateTimeCalculatorMonths(
+    times: Array<Byte>
+) = CommonNearDateTimeCalculator(
+    times,
+    { it.month0.toByte() },
+    { dateTime, newOne ->
+        (if (newOne < dateTime.month0) {
+            dateTime.plus(1.years)
+        } else {
+            dateTime
+        }).copy(
+            month = newOne.toInt() + 1, // index1
+            dayOfMonth = 1, // index1
+            hour = 0,
+            minute = 0,
+            second = 0,
+            milliseconds = 0
+        )
+    }
+)
+
+internal fun NearDateTimeCalculatorWeekDays(
+    times: Array<Byte>
+) = CommonNearDateTimeCalculator(
+    times,
+    { it.dayOfWeek.index0.toByte() },
+    { dateTime, newOne ->
+        val currentDayOfWeek = dateTime.dayOfWeek.index0
+        if (newOne.toInt() == currentDayOfWeek) return@CommonNearDateTimeCalculator dateTime
+        (if (newOne < currentDayOfWeek) {
+            dateTime.plus(7.days - (currentDayOfWeek - newOne).days)
+        } else {
+            dateTime.plus(newOne.toInt().days - currentDayOfWeek.days)
+        }).copy(
+            hour = 0,
+            minute = 0,
+            second = 0,
+            milliseconds = 0
+        )
+    }
+)
+
+internal fun NearDateTimeCalculatorYears(
+    times: Array<Int>
+) = CommonNearDateTimeCalculator(
+    times,
+    { it.yearInt },
+    { dateTime, newOne ->
+        val currentYear = dateTime.yearInt
+        if (newOne == currentYear) return@CommonNearDateTimeCalculator dateTime
+        (if (newOne < currentYear) {
+            null
+        } else {
+            dateTime.plus(newOne.years - currentYear.years)
+        }) ?.copy(
+            month = 1, // index1
+            dayOfMonth = 1, // index1
+            hour = 0,
+            minute = 0,
+            second = 0,
+            milliseconds = 0
+        )
+    }
+)

src/commonMain/kotlin/internal/Parser.kt

@@ -0,0 +1,77 @@
+package dev.inmo.krontab.internal
+
+typealias Converter<T> = (Int) -> T
+
+internal val intToByteConverter: Converter<Byte> = { it: Int -> it.toByte() }
+internal val intToShortConverter: Converter<Short> = { it: Int -> it.toShort() }
+internal val intToIntConverter: Converter<Int> = { it: Int -> it }
+private fun <T> createSimpleScheduler(from: String, dataRange: IntRange, dataConverter: Converter<T>): List<T>? {
+    val things = from.split(",")
+
+    val results = things.flatMap {
+        val currentToken = it.lowercase().replace(
+            "f", dataRange.first.toString()
+        ).replace(
+            "l", dataRange.last.toString()
+        )
+        when {
+            currentToken.contains("-") -> {
+                val splitted = currentToken.split("-")
+                (splitted.first().toInt().coerceIn(dataRange) .. splitted[1].toInt().coerceIn(dataRange)).toList()
+            }
+            currentToken.contains("/") -> {
+                val (start, step) = currentToken.split("/")
+                val startNum = (if (start.isEmpty() || start == "*") {
+                    0
+                } else {
+                    start.toInt()
+                }).coerceIn(dataRange)
+                val stepNum = step.toInt().coerceIn(dataRange)
+                (startNum .. dataRange.last step stepNum).map { it }
+            }
+            currentToken == "*" -> return null
+            else -> listOf(currentToken.toInt().coerceIn(dataRange))
+        }
+    }
+
+    return results.map(dataConverter)
+}
+
+internal fun parseWeekDay(from: String?) = from ?.let { if (it.endsWith("w")) createSimpleScheduler(it.removeSuffix("w"), dayOfWeekRange, intToByteConverter) ?.toTypedArray() else null }
+internal fun parseOffset(from: String?) = from ?.let { if (it.endsWith("o")) it.removeSuffix("o").toIntOrNull() else null }
+internal fun parseYears(from: String?) = from ?.let { createSimpleScheduler(from, yearRange, intToIntConverter) ?.toTypedArray() }
+internal fun parseMonths(from: String) = createSimpleScheduler(from, monthRange, intToByteConverter) ?.toTypedArray()
+internal fun parseDaysOfMonth(from: String) = createSimpleScheduler(from, dayOfMonthRange, intToByteConverter) ?.toTypedArray()
+internal fun parseHours(from: String) = createSimpleScheduler(from, hoursRange, intToByteConverter) ?.toTypedArray()
+internal fun parseMinutes(from: String) = createSimpleScheduler(from, minutesRange, intToByteConverter) ?.toTypedArray()
+internal fun parseSeconds(from: String) = createSimpleScheduler(from, secondsRange, intToByteConverter) ?.toTypedArray()
+internal fun parseMilliseconds(from: String?) = from ?.let { if (it.endsWith("ms")) createSimpleScheduler(from.removeSuffix("ms"), millisecondsRange, intToShortConverter) ?.toTypedArray() else null }
+
+internal fun <T> Array<T>.fillWith(
+    whereToPut: MutableList<CronDateTime>,
+    createFactory: (CronDateTime, T) -> CronDateTime
+) {
+    val previousValues = whereToPut.toList()
+
+    whereToPut.clear()
+
+    previousValues.forEach { previousValue ->
+        forEach {
+            whereToPut.add(createFactory(previousValue, it))
+        }
+    }
+}
+
+internal fun <T> T.fillWith(
+    whereToPut: MutableList<CronDateTime>,
+    createFactory: (CronDateTime, T) -> CronDateTime
+) {
+    val previousValues = whereToPut.toList()
+
+    whereToPut.clear()
+
+    previousValues.forEach { previousValue ->
+        whereToPut.add(createFactory(previousValue, this))
+    }
+}
+

src/commonMain/kotlin/internal/Ranges.kt

@@ -1,7 +1,10 @@
-package com.insanusmokrassar.krontab.internal
+package dev.inmo.krontab.internal
 
+internal val dayOfWeekRange = 0 .. 6
+internal val yearRange = Int.MIN_VALUE .. Int.MAX_VALUE
 internal val monthRange = 0 .. 11
 internal val dayOfMonthRange = 0 .. 30
 internal val hoursRange = 0 .. 23
 internal val minutesRange = 0 .. 59
 internal val secondsRange = minutesRange
+internal val millisecondsRange = 0 .. 999

src/commonMain/kotlin/utils/DateTimeCopy.kt

@@ -0,0 +1,23 @@
+package dev.inmo.krontab.utils
+
+import korlibs.time.DateTime
+import korlibs.time.Month
+import kotlin.math.min
+
+fun DateTime.copy(
+    year: Int = yearInt,
+    month: Int = month1,
+    dayOfMonth: Int = this.dayOfMonth,
+    hour: Int = hours,
+    minute: Int = minutes,
+    second: Int = seconds,
+    milliseconds: Int = this.milliseconds
+) = DateTime(
+    year,
+    month,
+    min(Month(month).days(yearInt), dayOfMonth),
+    hour,
+    minute,
+    second,
+    milliseconds
+)

src/commonMain/kotlin/utils/SchedulerFlow.kt

@@ -0,0 +1,94 @@
+package dev.inmo.krontab.utils
+
+import korlibs.time.DateTime
+import korlibs.time.DateTimeTz
+import korlibs.time.milliseconds
+import dev.inmo.krontab.KronScheduler
+import dev.inmo.krontab.next
+import korlibs.time.millisecondsLong
+import kotlinx.coroutines.currentCoroutineContext
+import kotlinx.coroutines.delay
+import kotlinx.coroutines.flow.Flow
+import kotlinx.coroutines.flow.flow
+import kotlinx.coroutines.flow.onEach
+import kotlinx.coroutines.isActive
+
+/**
+ * **This flow is [cold](https://kotlinlang.org/api/kotlinx.coroutines/kotlinx-coroutines-core/kotlinx.coroutines.flow/-flow/)**
+ *
+ * Will emit all the [KronScheduler.next] as soon as possible. In case [KronScheduler.next] return null, flow will
+ * be completed
+ *
+ * @param since Will be used as the first parameter for [KronScheduler.next] fun. If passed null, `flow`
+ * will always start since the moment of collecting start
+ */
+fun KronScheduler.asTzFlowWithoutDelays(since: DateTimeTz? = null): Flow<DateTimeTz> = flow {
+    var previous = since ?: DateTime.nowLocal()
+    while (currentCoroutineContext().isActive) {
+        val next = next(previous) ?: break
+        emit(next)
+        previous = next + 1.milliseconds
+    }
+}
+
+/**
+ * **This flow is [cold](https://kotlinlang.org/api/kotlinx.coroutines/kotlinx-coroutines-core/kotlinx.coroutines.flow/-flow/)**
+ *
+ * This [Flow] will use [asTzFlowWithoutDelays], but stop on each time until this time will happen
+ */
+fun KronScheduler.asTzFlowWithDelays(): Flow<DateTimeTz> = asTzFlowWithoutDelays().onEach { futureHappenTime ->
+    val now = DateTime.nowLocal()
+
+    delay((futureHappenTime - now).millisecondsLong)
+}
+
+/**
+ * **This flow is [cold](https://kotlinlang.org/api/kotlinx.coroutines/kotlinx-coroutines-core/kotlinx.coroutines.flow/-flow/)**
+ *
+ * This [Flow] will use [asTzFlowWithoutDelays], but stop on each time until this time will happen
+ */
+@Deprecated(
+    "Behaviour will be changed. In some of near versions this flow will not delay executions",
+    ReplaceWith("this.asTzFlowWithDelays()", "dev.inmo.krontab.utils.asTzFlowWithDelays")
+)
+fun KronScheduler.asTzFlow(): Flow<DateTimeTz> = asTzFlowWithDelays()
+
+/**
+ * **This flow is [cold](https://kotlinlang.org/api/kotlinx.coroutines/kotlinx-coroutines-core/kotlinx.coroutines.flow/-flow/)**
+ *
+ * Will emit all the [KronScheduler.next] as soon as possible. In case [KronScheduler.next] return null, flow will
+ * be completed
+ *
+ * @param since Will be used as the first parameter for [KronScheduler.next] fun. If passed null, `flow`
+ * will always start since the moment of collecting start
+ */
+fun KronScheduler.asFlowWithoutDelays(since: DateTime? = null): Flow<DateTime> = flow {
+    var previous = since ?: DateTime.now()
+    while (currentCoroutineContext().isActive) {
+        val next = next(previous) ?: break
+        emit(next)
+        previous = next + 1.milliseconds
+    }
+}
+
+/**
+ * **This flow is [cold](https://kotlinlang.org/api/kotlinx.coroutines/kotlinx-coroutines-core/kotlinx.coroutines.flow/-flow/)**
+ *
+ * This [Flow] will use [asFlowWithoutDelays], but stop on each time until this time will happen
+ */
+fun KronScheduler.asFlowWithDelays(): Flow<DateTime> = asFlowWithoutDelays().onEach { futureHappenTime ->
+    val now = DateTime.now()
+
+    delay((futureHappenTime - now).millisecondsLong)
+}
+
+/**
+ * **This flow is [cold](https://kotlinlang.org/api/kotlinx.coroutines/kotlinx-coroutines-core/kotlinx.coroutines.flow/-flow/)**
+ *
+ * This [Flow] will use [asFlowWithDelays], but stop on each time until this time will happen
+ */
+@Deprecated(
+    "Behaviour will be changed. In some of near versions this flow will not delay executions",
+    ReplaceWith("this.asFlowWithDelays()", "dev.inmo.krontab.utils.asFlowWithDelays")
+)
+fun KronScheduler.asFlow(): Flow<DateTime> = asFlowWithDelays()

src/commonMain/kotlin/utils/Typealiases.kt

@@ -0,0 +1,3 @@
+package dev.inmo.krontab.utils
+
+typealias Minutes = Int

src/commonMain/kotlin/utils/flows/DateTimeFilters.kt

@@ -0,0 +1,34 @@
+package dev.inmo.krontab.utils.flows
+
+import korlibs.time.*
+import kotlinx.coroutines.flow.Flow
+import kotlinx.coroutines.flow.filter
+
+@Suppress("NOTHING_TO_INLINE")
+inline fun Flow<DateTime>.filterSeconds(vararg seconds: Int) = filter { it.seconds in seconds }
+
+@Suppress("NOTHING_TO_INLINE")
+inline fun Flow<DateTime>.filterMinutes(vararg minutes: Int) = filter { it.minutes in minutes }
+
+@Suppress("NOTHING_TO_INLINE")
+inline fun Flow<DateTime>.filterHours(vararg hours: Int) = filter { it.hours in hours }
+
+@Suppress("NOTHING_TO_INLINE")
+inline fun Flow<DateTime>.filterDaysOfMonths(vararg daysOfMonths: Int) = filter { it.dayOfMonth in daysOfMonths }
+
+@Suppress("NOTHING_TO_INLINE")
+inline fun Flow<DateTime>.filterMonths(vararg months: Month) = filter { it.month in months }
+@Suppress("NOTHING_TO_INLINE")
+inline fun Flow<DateTime>.filterMonths0(vararg months: Int) = filter { it.month0 in months }
+@Suppress("NOTHING_TO_INLINE")
+inline fun Flow<DateTime>.filterMonths1(vararg months: Int) = filter { it.month1 in months }
+
+@Suppress("NOTHING_TO_INLINE")
+inline fun Flow<DateTime>.filterYears(year: Year) = filter { it.year == year }
+@Suppress("NOTHING_TO_INLINE")
+inline fun Flow<DateTime>.filterYears(vararg years: Int) = filter { it.yearInt in years }
+
+@Suppress("NOTHING_TO_INLINE")
+inline fun Flow<DateTime>.filterWeekDays(vararg weekDays: DayOfWeek) = filter { it.dayOfWeek in weekDays }
+@Suppress("NOTHING_TO_INLINE")
+inline fun Flow<DateTime>.filterWeekDays(vararg weekDays: Int) = filter { it.dayOfWeekInt in weekDays }

src/commonMain/kotlin/utils/flows/DateTimeTzFilters.kt

@@ -0,0 +1,34 @@
+package dev.inmo.krontab.utils.flows
+
+import korlibs.time.*
+import kotlinx.coroutines.flow.Flow
+import kotlinx.coroutines.flow.filter
+
+@Suppress("NOTHING_TO_INLINE")
+inline fun Flow<DateTimeTz>.filterSeconds(vararg seconds: Int) = filter { it.seconds in seconds }
+
+@Suppress("NOTHING_TO_INLINE")
+inline fun Flow<DateTimeTz>.filterMinutes(vararg minutes: Int) = filter { it.minutes in minutes }
+
+@Suppress("NOTHING_TO_INLINE")
+inline fun Flow<DateTimeTz>.filterHours(vararg hours: Int) = filter { it.hours in hours }
+
+@Suppress("NOTHING_TO_INLINE")
+inline fun Flow<DateTimeTz>.filterDaysOfMonths(vararg daysOfMonths: Int) = filter { it.dayOfMonth in daysOfMonths }
+
+@Suppress("NOTHING_TO_INLINE")
+inline fun Flow<DateTimeTz>.filterMonths(vararg months: Month) = filter { it.month in months }
+@Suppress("NOTHING_TO_INLINE")
+inline fun Flow<DateTimeTz>.filterMonths0(vararg months: Int) = filter { it.month0 in months }
+@Suppress("NOTHING_TO_INLINE")
+inline fun Flow<DateTimeTz>.filterMonths1(vararg months: Int) = filter { it.month1 in months }
+
+@Suppress("NOTHING_TO_INLINE")
+inline fun Flow<DateTimeTz>.filterYears(year: Year) = filter { it.year == year }
+@Suppress("NOTHING_TO_INLINE")
+inline fun Flow<DateTimeTz>.filterYears(vararg years: Int) = filter { it.yearInt in years }
+
+@Suppress("NOTHING_TO_INLINE")
+inline fun Flow<DateTimeTz>.filterWeekDays(vararg weekDays: DayOfWeek) = filter { it.dayOfWeek in weekDays }
+@Suppress("NOTHING_TO_INLINE")
+inline fun Flow<DateTimeTz>.filterWeekDays(vararg weekDays: Int) = filter { it.dayOfWeekInt in weekDays }

src/commonMain/kotlin/utils/flows/DateTimeTzWhen.kt

@@ -0,0 +1,25 @@
+package dev.inmo.krontab.utils.flows
+
+import korlibs.time.*
+import kotlinx.coroutines.flow.Flow
+
+@Suppress("NOTHING_TO_INLINE")
+inline fun Flow<DateTime>.onlyStartsOfMinutes() = filterSeconds(0)
+
+@Suppress("NOTHING_TO_INLINE")
+inline fun Flow<DateTime>.onlyStartsOfHours() = filterMinutes(0).onlyStartsOfMinutes()
+
+@Suppress("NOTHING_TO_INLINE")
+inline fun Flow<DateTime>.onlyStartsOfDays() = filterHours(0).onlyStartsOfHours()
+
+@Suppress("NOTHING_TO_INLINE")
+inline fun Flow<DateTime>.onlyStartsOfMondays() = filterWeekDays(DayOfWeek.Monday).onlyStartsOfDays()
+
+@Suppress("NOTHING_TO_INLINE")
+inline fun Flow<DateTime>.onlyStartsOfSundays() = filterWeekDays(DayOfWeek.Sunday).onlyStartsOfDays()
+
+@Suppress("NOTHING_TO_INLINE")
+inline fun Flow<DateTime>.onlyStartsOfMonths() = filterDaysOfMonths(1).onlyStartsOfDays()
+
+@Suppress("NOTHING_TO_INLINE")
+inline fun Flow<DateTime>.onlyStartsOfYears() = filterMonths(Month.January).onlyStartsOfMonths()

src/commonMain/kotlin/utils/flows/DateTimeWhen.kt

@@ -0,0 +1,25 @@
+package dev.inmo.krontab.utils.flows
+
+import korlibs.time.*
+import kotlinx.coroutines.flow.Flow
+
+@Suppress("NOTHING_TO_INLINE")
+inline fun Flow<DateTimeTz>.onlyStartsOfMinutes() = filterSeconds(0)
+
+@Suppress("NOTHING_TO_INLINE")
+inline fun Flow<DateTimeTz>.onlyStartsOfHours() = filterMinutes(0).onlyStartsOfMinutes()
+
+@Suppress("NOTHING_TO_INLINE")
+inline fun Flow<DateTimeTz>.onlyStartsOfDays() = filterHours(0).onlyStartsOfHours()
+
+@Suppress("NOTHING_TO_INLINE")
+inline fun Flow<DateTimeTz>.onlyStartsOfMondays() = filterWeekDays(DayOfWeek.Monday).onlyStartsOfDays()
+
+@Suppress("NOTHING_TO_INLINE")
+inline fun Flow<DateTimeTz>.onlyStartsOfSundays() = filterWeekDays(DayOfWeek.Sunday).onlyStartsOfDays()
+
+@Suppress("NOTHING_TO_INLINE")
+inline fun Flow<DateTimeTz>.onlyStartsOfMonths() = filterDaysOfMonths(1).onlyStartsOfDays()
+
+@Suppress("NOTHING_TO_INLINE")
+inline fun Flow<DateTimeTz>.onlyStartsOfYears() = filterMonths(Month.January).onlyStartsOfMonths()

src/commonTest/kotlin/BuildersTest.kt

@@ -0,0 +1,38 @@
+package dev.inmo.krontab.utils
+
+import dev.inmo.krontab.*
+import korlibs.time.*
+import kotlinx.coroutines.test.runTest
+import kotlin.test.Test
+import kotlin.test.assertEquals
+import kotlin.time.Duration.Companion.milliseconds
+import kotlin.time.Duration.Companion.minutes
+import kotlin.time.Duration.Companion.seconds
+
+class BuildersTest {
+    @Test
+    fun presetsWorksCorrectly() {
+        val data = mapOf(
+            EverySecondScheduler to { it: DateTime -> if (it.milliseconds > 0 ) it + 1.seconds - it.milliseconds.milliseconds else it },
+            EveryMinuteScheduler to { it: DateTime -> if (it.seconds > 0 || it.milliseconds > 0 ) it + 1.minutes - it.seconds.seconds - it.milliseconds.milliseconds else it },
+            EveryHourScheduler to { it: DateTime -> if (it.minutes > 0 || it.seconds > 0 || it.milliseconds > 0 ) it + 1.hours - it.minutes.minutes - it.seconds.seconds - it.milliseconds.milliseconds else it },
+            EveryDayOfMonthScheduler to { it: DateTime -> if (it.hours > 0 || it.minutes > 0 || it.seconds > 0 || it.milliseconds > 0 ) it + 1.days - it.hours.hours - it.minutes.minutes - it.seconds.seconds - it.milliseconds.milliseconds else it },
+            EveryMonthScheduler to { it: DateTime -> if (it.dayOfMonth > 1 || it.hours > 0 || it.minutes > 0 || it.seconds > 0 || it.milliseconds > 0 ) (it + 1.months).copy(dayOfMonth = 1, hour = 0, minute = 0, second = 0, milliseconds = 0) else it },
+        )
+        val samples = 10000
+
+        runTest {
+            var now = DateTime.now()
+            for (i in 0 until samples) {
+                data.forEach { (scheduler, expectCalculator) ->
+                    val expectValue = expectCalculator(now)
+                    val newNow = scheduler.nextOrRelative(now)
+
+                    assertEquals(expectValue, newNow, "For time ${now.toStringDefault()} calculated wrong value: ${newNow.toStringDefault()} is not equal to ${expectValue.toStringDefault()}")
+
+                    now = newNow
+                }
+            }
+        }
+    }
+}

src/commonTest/kotlin/CheckMonthsAndDaysCorrectWork.kt

@@ -0,0 +1,23 @@
+package dev.inmo.krontab.utils
+
+import korlibs.time.DateTime
+import korlibs.time.days
+import dev.inmo.krontab.buildSchedule
+import kotlinx.coroutines.test.runTest
+import kotlin.test.*
+
+class CheckMonthsAndDaysCorrectWork {
+    @Test
+    fun checkMonthsAndDaysCorrectWork() {
+        val now = DateTime.now().startOfYear.startOfDay
+        for (i in 0 until now.year.days) {
+            val scheduleDateTime = (now + i.days)
+            runTest {
+                assertEquals(
+                    scheduleDateTime,
+                    buildSchedule("0 0 0 ${scheduleDateTime.dayOfMonth - 1} ${scheduleDateTime.month0}").next(now)
+                )
+            }
+        }
+    }
+}

src/commonTest/kotlin/FailJob.kt

@@ -1,6 +1,8 @@
-package com.insanusmokrassar.krontab.utils
+package dev.inmo.krontab.utils
 
-import kotlinx.coroutines.*
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.delay
+import kotlinx.coroutines.launch
 
 fun CoroutineScope.createFailJob(forTimeMillis: Long) = launch {
     delay(forTimeMillis)

src/commonTest/kotlin/SchedulerFlow.kt

@@ -1,10 +1,9 @@
-package com.insanusmokrassar.krontab.utils
+package dev.inmo.krontab.utils
 
-import com.insanusmokrassar.krontab.builder.buildSchedule
+import dev.inmo.krontab.builder.buildSchedule
-import com.soywiz.klock.DateTime
 import kotlinx.coroutines.*
-import kotlinx.coroutines.flow.collect
 import kotlinx.coroutines.flow.takeWhile
+import kotlinx.coroutines.test.runTest
 import kotlin.test.Test
 import kotlin.test.assertEquals
 
@@ -19,7 +18,7 @@ class SchedulerFlowTests {
             }
         }
 
-        val flow = kronScheduler.asFlow()
+        val flow = kronScheduler.asFlowWithoutDelays()
 
         runTest {
             val mustBeCollected = 10
@@ -41,14 +40,14 @@ class SchedulerFlowTests {
             }
         }
 
-        val flow = kronScheduler.asFlow()
+        val flow = kronScheduler.asFlowWithoutDelays()
 
         runTest {
             val testsCount = 10
-            val failJob = it.createFailJob((testsCount * 2) * 1000L)
+            val failJob = createFailJob((testsCount * 2) * 1000L)
             val mustBeCollected = 10
             val answers = (0 until testsCount).map { _ ->
-                it.async {
+                async {
                     var collected = 0
                     flow.takeWhile {
                         collected < mustBeCollected

src/commonTest/kotlin/StringParseTest.kt

@@ -0,0 +1,138 @@
+package dev.inmo.krontab.utils
+
+import korlibs.time.*
+import dev.inmo.krontab.KronSchedulerTz
+import dev.inmo.krontab.buildSchedule
+import kotlinx.coroutines.*
+import kotlinx.coroutines.flow.takeWhile
+import kotlinx.coroutines.test.runTest
+import kotlin.test.*
+
+@ExperimentalCoroutinesApi
+@FlowPreview
+class StringParseTest {
+    @Test
+    fun testThatFlowIsCorrectlyWorkEverySecondBuiltOnString() {
+        val kronScheduler = buildSchedule("*/1 * * * *")
+
+        val flow = kronScheduler.asFlowWithoutDelays()
+
+        runTest {
+            val mustBeCollected = 10
+            var collected = 0
+            flow.takeWhile {
+                collected < mustBeCollected
+            }.collect {
+                collected++
+            }
+            assertEquals(mustBeCollected, collected)
+        }
+    }
+    @Test
+    fun testThatFlowIsCorrectlyWorkEverySecondWhenMillisIsHalfOfSecondBuiltOnString() {
+        val kronScheduler = buildSchedule("*/1 * * * * 500ms")
+
+        val flow = kronScheduler.asFlowWithoutDelays()
+
+        runTest {
+            val mustBeCollected = 10
+            var collected = 0
+            flow.takeWhile {
+                collected < mustBeCollected
+            }.collect {
+                collected++
+            }
+            assertEquals(mustBeCollected, collected)
+        }
+    }
+
+    @Test
+    fun testThatFlowIsCorrectlyWorkEverySecondWithMuchOfEmittersBuiltOnString() {
+        val kronScheduler = buildSchedule("*/1 * * * *")
+
+        val flow = kronScheduler.asFlowWithoutDelays()
+
+        runTest {
+            val testsCount = 10
+            val failJob = createFailJob((testsCount * 2) * 1000L)
+            val mustBeCollected = 10
+            val answers = (0 until testsCount).map { _ ->
+                async {
+                    var collected = 0
+                    flow.takeWhile {
+                        collected < mustBeCollected
+                    }.collect {
+                        collected++
+                    }
+                    collected
+                }
+            }.awaitAll()
+
+            failJob.cancel()
+
+            answers.forEach {
+                assertEquals(mustBeCollected, it)
+            }
+        }
+    }
+    @Test
+    fun testThatFlowIsCorrectlyWorkEverySeveralSecondsRangeBuiltOnString() {
+        val rangesEnds = listOf(0 to 5, 30 to 35)
+        val kronScheduler = buildSchedule("${rangesEnds.joinToString(",") { "${it.first}-${it.second}" }} * * * *")
+
+        val flow = kronScheduler.asFlowWithoutDelays()
+
+        runTest {
+            val ranges = rangesEnds.map { it.first .. it.second }.flatten().distinct().toMutableList()
+            val expectedCollects = ranges.size
+            var collected = 0
+
+            flow.takeWhile { ranges.isNotEmpty() }.collect {
+                ranges.remove(it.seconds)
+                collected++
+                assertTrue(
+                    collected <= expectedCollects,
+                    "Expected value should be less than $expectedCollects, but was $collected. Ranges state: $ranges"
+                )
+            }
+            assertEquals(expectedCollects, collected)
+        }
+    }
+    @Test
+    fun testNextIsCorrectlyWorkEverySeveralMillisecondsRangeBuiltOnString() {
+        val rangesEnds = listOf(0, 200, 500, 750)
+        val kronScheduler = buildSchedule("* * * * * ${rangesEnds.joinToString(",") { "$it" }}ms")
+
+        runTest {
+            val ranges = rangesEnds.toMutableList()
+            val expectedCollects = ranges.size
+            var collected = 0
+
+            var currentTime = DateTime.now()
+            while (ranges.isNotEmpty()) {
+                val nextTrigger = kronScheduler.next(currentTime) ?: error("Strangely unable to get next time")
+
+                ranges.remove(nextTrigger.milliseconds)
+                collected++
+
+                currentTime = nextTrigger + 1.milliseconds
+            }
+            assertEquals(expectedCollects, collected)
+        }
+    }
+    @Test
+    fun testThatTimezoneCorrectlyDeserialized() {
+        val now = DateTime.now().copy(milliseconds = 0).local
+
+        runTest {
+            for (i in 0 .. 1339) {
+                val expectedInCurrentOffset = now.toOffset(TimezoneOffset(i.minutes)) + 1.hours
+                val kronScheduler = buildSchedule(
+                    "${expectedInCurrentOffset.seconds} ${expectedInCurrentOffset.minutes} ${expectedInCurrentOffset.hours} * * ${i}o"
+                ) as KronSchedulerTz
+                val next = kronScheduler.next(now)
+                assertEquals(expectedInCurrentOffset.toOffset(now.offset), next)
+            }
+        }
+    }
+}

src/commonTest/kotlin/TimeZoneTest.kt

@@ -0,0 +1,29 @@
+package dev.inmo.krontab.utils
+
+import korlibs.time.*
+import dev.inmo.krontab.builder.buildSchedule
+import dev.inmo.krontab.next
+import kotlinx.coroutines.test.runTest
+import kotlin.test.Test
+import kotlin.test.assertEquals
+
+class TimeZoneTest {
+    @Test
+    fun testDifferentTimeZonesReturnsDifferentTimes() {
+        val scheduler = buildSchedule { seconds { every(1) } }
+        val additionalMilliseconds = 100.milliseconds
+        val baseDate = DateTime.now().startOfWeek.copy(milliseconds = additionalMilliseconds.millisecondsInt)
+        runTest {
+            for (i in 0 until 7) {
+                val now = baseDate + i.days
+                for (j in 0 .. 24) {
+                    val nowTz = now.toOffset(j.hours)
+                    val next = scheduler.next(nowTz)!!
+                    assertEquals(
+                        (nowTz + 1.seconds - additionalMilliseconds).utc.unixMillisLong, next.utc.unixMillisLong
+                    )
+                }
+            }
+        }
+    }
+}

src/commonTest/kotlin/WeekDaysTest.kt

@@ -0,0 +1,39 @@
+package dev.inmo.krontab.utils
+
+import korlibs.time.*
+import dev.inmo.krontab.builder.buildSchedule
+import kotlinx.coroutines.test.runTest
+import kotlin.math.ceil
+import kotlin.test.*
+
+class WeekDaysTest {
+    @Test
+    fun testThatWeekDaysSchedulingWorks() {
+        val startDateTime = DateTime.now().startOfDay
+        val weekDay = startDateTime.dayOfWeek.index0
+        val testDays = 400
+        val scheduler = buildSchedule {
+            dayOfWeek {
+                at(weekDay)
+            }
+            years {
+                at(startDateTime.yearInt)
+            }
+        }
+        runTest {
+            for (day in 0 until testDays) {
+                val currentDateTime = startDateTime + day.days
+                val next = scheduler.next(currentDateTime)
+                val expected = when {
+                    day % 7 == 0 -> currentDateTime
+                    else -> startDateTime + ceil(day.toFloat() / 7).weeks
+                }
+                if (expected.yearInt != startDateTime.yearInt) {
+                    assertNull(next)
+                } else {
+                    assertEquals(expected, next)
+                }
+            }
+        }
+    }
+}

src/commonTest/kotlin/com/insanusmokrassar/krontab/utils/RunTest.kt

@@ -1,8 +0,0 @@
-package com.insanusmokrassar.krontab.utils
-
-import kotlinx.coroutines.CoroutineScope
-
-/**
- * Workaround to use suspending functions in unit tests
- */
-expect fun runTest(block: suspend (scope : CoroutineScope) -> Unit)

src/commonTest/kotlin/com/insanusmokrassar/krontab/utils/StringParseTest.kt

@@ -1,82 +0,0 @@
-package com.insanusmokrassar.krontab.utils
-
-import com.insanusmokrassar.krontab.buildSchedule
-import com.soywiz.klock.DateTime
-import kotlinx.coroutines.*
-import kotlinx.coroutines.flow.collect
-import kotlinx.coroutines.flow.takeWhile
-import kotlin.math.max
-import kotlin.math.min
-import kotlin.test.Test
-import kotlin.test.assertEquals
-
-@ExperimentalCoroutinesApi
-@FlowPreview
-class StringParseTest {
-    @Test
-    fun testThatFlowIsCorrectlyWorkEverySecondBuiltOnString() {
-        val kronScheduler = buildSchedule("*/1 * * * *")
-
-        val flow = kronScheduler.asFlow()
-
-        runTest {
-            val mustBeCollected = 10
-            var collected = 0
-            flow.takeWhile {
-                collected < mustBeCollected
-            }.collect {
-                collected++
-            }
-            assertEquals(mustBeCollected, collected)
-        }
-    }
-
-    @Test
-    fun testThatFlowIsCorrectlyWorkEverySecondWithMuchOfEmittersBuiltOnString() {
-        val kronScheduler = buildSchedule("*/1 * * * *")
-
-        val flow = kronScheduler.asFlow()
-
-        runTest {
-            val testsCount = 10
-            val failJob = it.createFailJob((testsCount * 2) * 1000L)
-            val mustBeCollected = 10
-            val answers = (0 until testsCount).map { _ ->
-                it.async {
-                    var collected = 0
-                    flow.takeWhile {
-                        collected < mustBeCollected
-                    }.collect {
-                        collected++
-                    }
-                    collected
-                }
-            }.awaitAll()
-
-            failJob.cancel()
-
-            answers.forEach {
-                assertEquals(mustBeCollected, it)
-            }
-        }
-    }
-    @Test
-    fun testThatFlowIsCorrectlyWorkEverySeveralSecondsRangeBuiltOnString() {
-        val rangesEnds = listOf(0 to 5, 30 to 35)
-        val kronScheduler = buildSchedule("${rangesEnds.joinToString(",") { "${it.first}-${it.second}" }} * * * *")
-
-        val flow = kronScheduler.asFlow()
-
-        runTest {
-            val ranges = rangesEnds.map { it.first .. it.second }.flatten().toMutableList()
-            val expectedCollects = rangesEnds.sumBy { it.second - it.first + 1 }
-            var collected = 0
-
-            flow.takeWhile { ranges.isNotEmpty() }.collect {
-                ranges.remove(it.seconds)
-                collected++
-            }
-            assertEquals(expectedCollects, collected)
-        }
-    }
-}

src/jsTest/kotlin/com/insanusmokrassar/krontab/utils/RunTest.kt

@@ -1,5 +0,0 @@
-package com.insanusmokrassar.krontab.utils
-
-import kotlinx.coroutines.*
-
-actual fun runTest(block: suspend (scope : CoroutineScope) -> Unit): dynamic = GlobalScope.promise { block(this) }

src/jvmTest/kotlin/com/insanusmokrassar/krontab/utils/RunTest.kt

@@ -1,9 +0,0 @@
-package com.insanusmokrassar.krontab.utils
-
-import kotlinx.coroutines.CoroutineScope
-import kotlinx.coroutines.runBlocking
-
-/**
- * Workaround to use suspending functions in unit tests
- */
-actual fun runTest(block: suspend (scope: CoroutineScope) -> Unit) = runBlocking(block = block)