Merge pull request #16 from InsanusMokrassar/0.5.2

0.5.2

CHANGELOG.md

@@ -1,5 +1,17 @@
 # Changelog
 
+## 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

README.md

@@ -14,6 +14,8 @@ runtime of applications.
 | [ 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: Offsets ](#Offsets) |
+| [ How to use: Note about week days ](#Note-about-week-days) |
 
 ## How to use
 
@@ -52,14 +54,17 @@ 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) 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
@@ -152,3 +157,27 @@ 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 works 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

@@ -18,6 +18,18 @@ plugins {
     id "org.jetbrains.kotlin.multiplatform" version "$kotlin_version"
     id "org.jetbrains.dokka" version "$dokka_version"
 }
+
+// temporal crutch until legacy tests will be stabled or legacy target will be removed
+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"

gradle.properties

@@ -8,10 +8,10 @@ android.useAndroidX=true
 android.enableJetifier=false
 
 
-kotlin_version=1.4.31
+kotlin_version=1.4.32
 kotlin_coroutines_version=1.4.3
 
-dokka_version=1.4.20
+dokka_version=1.4.30
 
 klockVersion=2.0.7
 
@@ -33,6 +33,6 @@ androidx_work_version=2.5.0
 
 ## Common
 
-version=0.5.1
+version=0.5.2
-android_code_version=2
+android_code_version=3
 

src/commonMain/kotlin/dev/inmo/krontab/KronScheduler.kt

@@ -1,7 +1,6 @@
 package dev.inmo.krontab
 
 import com.soywiz.klock.DateTime
-import dev.inmo.krontab.internal.toNearDateTime
 
 /**
  * This interface was created for abstraction of [next] operation. Currently, there is only

src/commonMain/kotlin/dev/inmo/krontab/KronSchedulerTz.kt

@@ -0,0 +1,34 @@
+package dev.inmo.krontab
+
+import com.soywiz.klock.DateTime
+import com.soywiz.klock.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.localUnadjusted) ?.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/dev/inmo/krontab/KronSchedulersMerging.kt

@@ -1,8 +1,8 @@
 package dev.inmo.krontab
 
 import dev.inmo.krontab.collection.CollectionKronScheduler
-import dev.inmo.krontab.internal.CronDateTime
+import dev.inmo.krontab.collection.includeAll
-import dev.inmo.krontab.internal.CronDateTimeScheduler
+import dev.inmo.krontab.internal.*
 
 /**
  * Create new one [CollectionKronScheduler] to include all [KronScheduler]s of [this] [Iterator]
@@ -10,18 +10,23 @@ import dev.inmo.krontab.internal.CronDateTimeScheduler
  * @see CollectionKronScheduler
  * @see CollectionKronScheduler.include
  */
-fun Iterator<KronScheduler>.merge(): KronScheduler {
+fun Iterator<KronScheduler>.merge(): CollectionKronScheduler {
     val cronDateTimes = mutableListOf<CronDateTime>()
+    val timezonedCronDateTimes = mutableListOf<CronDateTimeSchedulerTz>()
     val collectionScheduler = CollectionKronScheduler()
     forEach {
         when (it) {
             is CronDateTimeScheduler -> cronDateTimes.addAll(it.cronDateTimes)
+            is CronDateTimeSchedulerTz -> timezonedCronDateTimes.add(it)
             else -> collectionScheduler.include(it)
         }
     }
     if (cronDateTimes.isNotEmpty()) {
         collectionScheduler.include(CronDateTimeScheduler(cronDateTimes))
     }
+    if (timezonedCronDateTimes.isNotEmpty()) {
+        collectionScheduler.includeAll(mergeCronDateTimeSchedulers(timezonedCronDateTimes))
+    }
     return collectionScheduler
 }
 
@@ -32,10 +37,10 @@ fun Iterator<KronScheduler>.merge(): KronScheduler {
  * @see CollectionKronScheduler.include
  */
 @Suppress("NOTHING_TO_INLINE")
-inline fun Iterable<KronScheduler>.merge(): KronScheduler = iterator().merge()
+inline fun Iterable<KronScheduler>.merge(): CollectionKronScheduler = iterator().merge()
 
 /**
  * @return Vararg shortcut for [merge]
  */
 @Suppress("NOTHING_TO_INLINE")
-inline fun merge(vararg kronDateTimeSchedulers: KronScheduler) = kronDateTimeSchedulers.iterator().merge()
+inline fun merge(vararg kronDateTimeSchedulers: KronScheduler): CollectionKronScheduler = kronDateTimeSchedulers.iterator().merge()

src/commonMain/kotlin/dev/inmo/krontab/SchedulerShortcuts.kt

@@ -3,8 +3,6 @@ package dev.inmo.krontab
 import com.soywiz.klock.DateTime
 import dev.inmo.krontab.builder.buildSchedule
 import dev.inmo.krontab.internal.*
-import dev.inmo.krontab.internal.CronDateTime
-import dev.inmo.krontab.internal.CronDateTimeScheduler
 
 internal val anyCronDateTime by lazy {
     CronDateTime()

src/commonMain/kotlin/dev/inmo/krontab/StringParser.kt

@@ -1,6 +1,9 @@
 package dev.inmo.krontab
 
+import com.soywiz.klock.TimezoneOffset
+import com.soywiz.klock.minutes
 import dev.inmo.krontab.internal.*
+import dev.inmo.krontab.utils.Minutes
 
 /**
  * @see createSimpleScheduler
@@ -17,8 +20,10 @@ typealias KrontabTemplate = String
  * * dayOfMonth
  * * month
  * * (optional) year
+ * * (optional) (can be placed anywhere after month) (must be marked with `o` at the end, for example: 60o == +01:00) offset
+ * * (optional) (can be placed anywhere after month) dayOfWeek
  *
- * And each one have next format:
+ * And each one (except of offsets) have next format:
  *
  * `{number}[,{number},...]` or `*`
  *
@@ -31,6 +36,9 @@ typealias KrontabTemplate = String
  * * 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]
@@ -39,6 +47,7 @@ typealias KrontabTemplate = String
  * * 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]
  *
  * Examples:
  *
@@ -46,14 +55,41 @@ typealias KrontabTemplate = String
  * * "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
  * * "1 2 3 F,4,L 5" for triggering in near first second of second minute of third hour of fourth day of may
+ * * "1 2 3 F,4,L 5 60o" for triggering in near first second of second minute of third hour of fourth day 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 fourth day 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 fourth day 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 fourth day 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 fourth day of may of 2021st year if it will be in Sunday-Tuesday week days with timezone UTC+01:00
+ *
+ * @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
  */
-fun createSimpleScheduler(incoming: KrontabTemplate): KronScheduler {
+fun createSimpleScheduler(
-    val yearSource: String?
+    incoming: KrontabTemplate
+): KronScheduler {
+    var offsetParsed: Int? = null
+    var dayOfWeekParsed: Array<Byte>? = null
+    var yearParsed: Array<Int>? = null
     val (secondsSource, minutesSource, hoursSource, dayOfMonthSource, monthSource) = incoming.split(" ").also {
-        yearSource = it.getOrNull(5)
+        listOfNotNull(
+            it.getOrNull(5),
+            it.getOrNull(6),
+            it.getOrNull(7)
+        ).forEach {
+            val offsetFromString = parseOffset(it)
+            val dayOfWeekFromString = parseWeekDay(it)
+            offsetParsed = offsetParsed ?: offsetFromString
+            dayOfWeekParsed = dayOfWeekParsed ?: dayOfWeekFromString
+            when {
+                dayOfWeekFromString != null || offsetFromString != null -> return@forEach
+                yearParsed == null -> {
+                    yearParsed = parseYears(it)
+                }
+            }
+        }
     }
 
     val secondsParsed = parseSeconds(secondsSource)
@@ -61,24 +97,54 @@ fun createSimpleScheduler(incoming: KrontabTemplate): KronScheduler {
     val hoursParsed = parseHours(hoursSource)
     val dayOfMonthParsed = parseDaysOfMonth(dayOfMonthSource)
     val monthParsed = parseMonths(monthSource)
-    val yearParsed = parseYears(yearSource)
 
-    return createKronScheduler(
+    return offsetParsed ?.let { offset ->
-        secondsParsed, minutesParsed, hoursParsed, dayOfMonthParsed, monthParsed, yearParsed
+        createKronSchedulerWithOffset(
+            secondsParsed, minutesParsed, hoursParsed, dayOfMonthParsed, monthParsed, yearParsed, dayOfWeekParsed, TimezoneOffset(offset.minutes)
         )
+    } ?: createKronScheduler(
+        secondsParsed, minutesParsed, hoursParsed, dayOfMonthParsed, monthParsed, yearParsed, dayOfWeekParsed
+    )
+}
+
+fun createSimpleScheduler(
+    incoming: KrontabTemplate,
+    defaultOffset: Minutes
+): KronSchedulerTz {
+    val scheduler = createSimpleScheduler(incoming)
+    return if (scheduler is KronSchedulerTz) {
+        scheduler
+    } else {
+        CronDateTimeSchedulerTz(
+            (scheduler as CronDateTimeScheduler).cronDateTimes,
+            TimezoneOffset(defaultOffset.minutes)
+        )
+    }
 }
 
 /**
  * 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/dev/inmo/krontab/builder/SchedulerBuilder.kt

@@ -1,7 +1,12 @@
 package dev.inmo.krontab.builder
 
+import com.soywiz.klock.TimezoneOffset
+import com.soywiz.klock.minutes
 import dev.inmo.krontab.KronScheduler
+import dev.inmo.krontab.KronSchedulerTz
 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]
@@ -16,13 +21,31 @@ fun buildSchedule(settingsBlock: SchedulerBuilder.() -> Unit): KronScheduler {
     return builder.build()
 }
 
+/**
+ * Will help to create an instance of [KronScheduler]
+ *
+ * @see dev.inmo.krontab.createSimpleScheduler
+ */
+fun buildSchedule(
+    offset: Minutes,
+    settingsBlock: SchedulerBuilder.() -> Unit
+): KronSchedulerTz {
+    val builder = SchedulerBuilder(offset = offset)
+
+    builder.settingsBlock()
+
+    return builder.build() as KronSchedulerTz
+}
+
 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 year: Array<Int>? = null,
+    private var dayOfWeek: Array<Byte>? = null,
+    private val offset: Minutes? = null
 ) {
     private fun <I, T : TimeBuilder<I>> callAndReturn(
         initial: Array<I>?,
@@ -84,6 +107,17 @@ class SchedulerBuilder(
         ) ?.toTypedArray()
     }
 
+    /**
+     * Starts an hours block
+     */
+    fun dayOfWeek(block: WeekDaysBuilder.() -> Unit) {
+        dayOfWeek = callAndReturn(
+            dayOfWeek,
+            WeekDaysBuilder(),
+            block
+        ) ?.toTypedArray()
+    }
+
     /**
      * Starts an months block
      */
@@ -112,5 +146,7 @@ class SchedulerBuilder(
      * @see dev.inmo.krontab.createSimpleScheduler
      * @see dev.inmo.krontab.internal.createKronScheduler
      */
-    fun build(): KronScheduler = createKronScheduler(seconds, minutes, hours, dayOfMonth, month, year)
+    fun build(): KronScheduler = offset ?.let {
+        createKronSchedulerWithOffset(seconds, minutes, hours, dayOfMonth, month, year, dayOfWeek, TimezoneOffset(it.minutes))
+    } ?: createKronScheduler(seconds, minutes, hours, dayOfMonth, month, year, dayOfWeek)
 }

src/commonMain/kotlin/dev/inmo/krontab/builder/TimeBuilder.kt

@@ -1,11 +1,10 @@
 package dev.inmo.krontab.builder
 
 import dev.inmo.krontab.internal.*
-import dev.inmo.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<T : Number> (
     private val restrictionsRange: IntRange,
@@ -37,7 +36,7 @@ sealed class TimeBuilder<T : Number> (
      */
     @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()
     }
 
@@ -46,7 +45,7 @@ sealed class TimeBuilder<T : Number> (
      */
     @Suppress("unused")
     infix fun at(value: Int) {
-        result = (result ?: emptySet()) + value.clamp(restrictionsRange)
+        result = (result ?: emptySet()) + value.coerceIn(restrictionsRange)
     }
 
 
@@ -70,7 +69,7 @@ sealed class TimeBuilder<T : Number> (
      * @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
@@ -88,7 +87,7 @@ sealed class TimeBuilder<T : Number> (
      */
     @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
@@ -129,3 +128,4 @@ class HoursBuilder : TimeBuilder<Byte>(hoursRange, intToByteConverter)
 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/dev/inmo/krontab/collection/CollectionKronScheduler.kt

@@ -1,17 +1,16 @@
 package dev.inmo.krontab.collection
 
 import com.soywiz.klock.DateTime
+import com.soywiz.klock.DateTimeTz
 import dev.inmo.krontab.*
 import dev.inmo.krontab.internal.*
-import dev.inmo.krontab.internal.CronDateTimeScheduler
-import dev.inmo.krontab.internal.toNearDateTime
 
 /**
  * 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>
-) : KronScheduler {
+) : KronSchedulerTz {
     internal constructor() : this(mutableListOf())
 
     /**
@@ -38,6 +37,18 @@ data class CollectionKronScheduler internal constructor(
                     mergeCronDateTimeSchedulers(resultCronDateTimes)
                 )
             }
+            is CronDateTimeSchedulerTz -> {
+                val newCronDateTimes = kronScheduler.cronDateTimes.toMutableList()
+                val cronDateTimes = schedulers.removeAll {
+                    if (it is CronDateTimeSchedulerTz && it.offset == kronScheduler.offset) {
+                        newCronDateTimes.addAll(it.cronDateTimes)
+                        true
+                    } else {
+                        false
+                    }
+                }
+                schedulers.add(CronDateTimeSchedulerTz(newCronDateTimes.toList(), kronScheduler.offset))
+            }
             is CollectionKronScheduler -> kronScheduler.schedulers.forEach {
                 include(it)
             }
@@ -48,4 +59,8 @@ data class CollectionKronScheduler internal constructor(
     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/dev/inmo/krontab/internal/CronDateTime.kt

@@ -1,10 +1,11 @@
 package dev.inmo.krontab.internal
 
-import com.soywiz.klock.DateTime
+import com.soywiz.klock.*
-import com.soywiz.klock.DateTimeSpan
 import dev.inmo.krontab.KronScheduler
 
 /**
+ * @param dayOfweek 0-6
+ * @param year any int
  * @param month 0-11
  * @param dayOfMonth 0-31
  * @param hours 0-23
@@ -12,6 +13,7 @@ import dev.inmo.krontab.KronScheduler
  * @param seconds 0-59
  */
 internal data class CronDateTime(
+    val dayOfweek: Byte? = null,
     val year: Int? = null,
     val month: Byte? = null,
     val dayOfMonth: Byte? = null,
@@ -20,6 +22,7 @@ internal data class CronDateTime(
     val seconds: Byte? = null
 ) {
     init {
+        check(dayOfweek ?.let { it in dayOfWeekRange } ?: true)
         check(year ?.let { it in yearRange } ?: true)
         check(month ?.let { it in monthRange } ?: true)
         check(dayOfMonth ?.let { it in dayOfMonthRange } ?: true)
@@ -29,14 +32,34 @@ internal data class CronDateTime(
     }
 
     internal val klockDayOfMonth = dayOfMonth ?.plus(1)
+    internal val dayOfWeekInt: Int? = dayOfweek ?.toInt()
 }
 
 /**
+ * THIS METHOD WILL <b>NOT</b> TAKE CARE ABOUT [offset] PARAMETER. It was decided due to the fact that we unable to get
+ * real timezone offset from simple [DateTime]
+ *
  * @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
 
+    val weekDay = dayOfWeekInt
+    if (weekDay != null && current.dayOfWeek.index0 != weekDay) {
+        do {
+            var diff = weekDay - current.dayOfWeek.index0
+            if (diff < 0) {
+                diff += 7 /* days in week */
+            }
+            current = (current + diff.days).startOfDay
+
+            val next = toNearDateTime(current)
+            if (next == null || next.dayOfWeek.index0 == weekDay) {
+                return next
+            }
+        } while (true)
+    }
+
     seconds?.let {
         val left = it - current.seconds
         current += DateTimeSpan(minutes = if (left <= 0) 1 else 0, seconds = left)
@@ -77,17 +100,15 @@ internal fun CronDateTime.toNearDateTime(relativelyTo: DateTime = DateTime.now()
     return current
 }
 
-/**
+internal fun createCronDateTimeList(
- * @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
+    years: Array<Int>? = null,
-): KronScheduler {
+    weekDays: Array<Byte>? = null
+): List<CronDateTime> {
     val resultCronDateTimes = mutableListOf(CronDateTime())
 
     seconds ?.fillWith(resultCronDateTimes) { previousCronDateTime: CronDateTime, currentTime: Byte ->
@@ -114,5 +135,35 @@ internal fun createKronScheduler(
         previousCronDateTime.copy(year = currentTime)
     }
 
-    return CronDateTimeScheduler(resultCronDateTimes.toList())
+    weekDays ?.fillWith(resultCronDateTimes) { previousCronDateTime: CronDateTime, currentTime: Byte ->
+        previousCronDateTime.copy(dayOfweek = currentTime)
     }
+
+    return resultCronDateTimes.toList()
+}
+
+/**
+ * @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
+): KronScheduler = CronDateTimeScheduler(createCronDateTimeList(seconds, minutes, hours, dayOfMonth, month, years, weekDays))
+/**
+ * @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
+): KronScheduler = CronDateTimeSchedulerTz(createCronDateTimeList(seconds, minutes, hours, dayOfMonth, month, years, weekDays), offset)

src/commonMain/kotlin/dev/inmo/krontab/internal/CronDateTimeScheduler.kt

@@ -1,7 +1,7 @@
 package dev.inmo.krontab.internal
 
 import com.soywiz.klock.DateTime
-import dev.inmo.krontab.*
+import dev.inmo.krontab.KronScheduler
 import dev.inmo.krontab.collection.plus
 
 /**
@@ -26,8 +26,8 @@ internal data class CronDateTimeScheduler internal constructor(
      *
      * @see toNearDateTime
      */
-    override suspend fun next(relatively: DateTime): DateTime {
+    override suspend fun next(relatively: DateTime): DateTime? {
-        return cronDateTimes.mapNotNull { it.toNearDateTime(relatively) }.minOrNull() ?: getAnyNext(relatively)
+        return cronDateTimes.mapNotNull { it.toNearDateTime(relatively) }.minOrNull()
     }
 }
 

src/commonMain/kotlin/dev/inmo/krontab/internal/CronDateTimeSchedulerTz.kt

@@ -0,0 +1,31 @@
+package dev.inmo.krontab.internal
+
+import com.soywiz.klock.DateTimeTz
+import com.soywiz.klock.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 cronDateTimes: List<CronDateTime>,
+    internal val offset: TimezoneOffset
+) : KronSchedulerTz {
+    override suspend fun next(relatively: DateTimeTz): DateTimeTz? {
+        val dateTimeWithActualOffset = relatively.toOffset(offset).local
+        return cronDateTimes.mapNotNull {
+            it.toNearDateTime(dateTimeWithActualOffset)
+        }.minOrNull() ?.toOffsetUnadjusted(offset) ?.toOffset(relatively.offset)
+    }
+}
+
+internal fun mergeCronDateTimeSchedulers(
+    schedulers: List<CronDateTimeSchedulerTz>
+) = schedulers.groupBy {
+    it.offset
+}.map { (offset, schedulers) ->
+    CronDateTimeSchedulerTz(schedulers.flatMap { it.cronDateTimes }, offset)
+}

src/commonMain/kotlin/dev/inmo/krontab/internal/Parser.kt

@@ -1,7 +1,5 @@
 package dev.inmo.krontab.internal
 
-import dev.inmo.krontab.utils.clamp
-
 typealias Converter<T> = (Int) -> T
 
 internal val intToByteConverter: Converter<Byte> = { it: Int -> it.toByte() }
@@ -18,7 +16,7 @@ private fun <T> createSimpleScheduler(from: String, dataRange: IntRange, dataCon
         when {
             currentToken.contains("-") -> {
                 val splitted = currentToken.split("-")
-                (splitted.first().toInt().clamp(dataRange) .. splitted[1].toInt().clamp(dataRange)).toList()
+                (splitted.first().toInt().coerceIn(dataRange) .. splitted[1].toInt().coerceIn(dataRange)).toList()
             }
             currentToken.contains("/") -> {
                 val (start, step) = currentToken.split("/")
@@ -26,18 +24,20 @@ private fun <T> createSimpleScheduler(from: String, dataRange: IntRange, dataCon
                     0
                 } else {
                     start.toInt()
-                }).clamp(dataRange)
+                }).coerceIn(dataRange)
-                val stepNum = step.toInt().clamp(dataRange)
+                val stepNum = step.toInt().coerceIn(dataRange)
                 (startNum .. dataRange.last step stepNum).map { it }
             }
             currentToken == "*" -> return null
-            else -> listOf(currentToken.toInt().clamp(dataRange))
+            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()
@@ -60,3 +60,16 @@ internal fun <T> Array<T>.fillWith(
     }
 }
 
+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/dev/inmo/krontab/internal/Ranges.kt

@@ -1,5 +1,6 @@
 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

src/commonMain/kotlin/dev/inmo/krontab/utils/Data.kt

@@ -1,12 +0,0 @@
-package dev.inmo.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/dev/inmo/krontab/utils/SchedulerFlow.kt

@@ -1,14 +1,39 @@
 package dev.inmo.krontab.utils
 
 import com.soywiz.klock.DateTime
+import com.soywiz.klock.DateTimeTz
 import dev.inmo.krontab.KronScheduler
-import kotlinx.coroutines.FlowPreview
+import dev.inmo.krontab.next
-import kotlinx.coroutines.delay
+import kotlinx.coroutines.*
 import kotlinx.coroutines.flow.*
 
+/**
+ * This [Flow] will trigger emitting each near time which will be returned from [this] [KronScheduler] with attention to
+ * time zones
+ *
+ * @see channelFlow
+ */
 @FlowPreview
-fun KronScheduler.asFlow(): Flow<DateTime> = SchedulerFlow(this)
+fun KronScheduler.asTzFlow(): Flow<DateTimeTz> = channelFlow {
+    while (isActive) {
+        val now = DateTime.now().local
+        val nextTime = next(now) ?: break
+        val sleepDelay = (nextTime - DateTime.now().local).millisecondsLong
+        delay(sleepDelay)
+        send(nextTime)
+    }
+}
 
+/**
+ * This method is a map for [asTzFlow] and will works the same but return flow with [DateTime]s
+ */
+@FlowPreview
+fun KronScheduler.asFlow(): Flow<DateTime> = asTzFlow().map { it.local }
+
+@Deprecated(
+    "It is not recommended to use this class in future. This functionality will be removed soon",
+    ReplaceWith("asFlow", "dev.inmo.krontab.utils.asFlow")
+)
 @FlowPreview
 class SchedulerFlow(
     private val scheduler: KronScheduler

src/commonMain/kotlin/dev/inmo/krontab/utils/Typealiases.kt

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

src/commonTest/kotlin/dev/inmo/krontab/utils/StringParseTest.kt

@@ -1,5 +1,7 @@
 package dev.inmo.krontab.utils
 
+import com.soywiz.klock.*
+import dev.inmo.krontab.KronSchedulerTz
 import dev.inmo.krontab.buildSchedule
 import kotlinx.coroutines.*
 import kotlinx.coroutines.flow.collect
@@ -76,4 +78,19 @@ class StringParseTest {
             assertEquals(expectedCollects, collected)
         }
     }
+    @Test
+    fun testThatTimezoneCorrectlyDeserialized() {
+        val now = DateTimeTz.nowLocal()
+
+        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/dev/inmo/krontab/utils/TimeZoneTest.kt

@@ -0,0 +1,27 @@
+package dev.inmo.krontab.utils
+
+import com.soywiz.klock.*
+import dev.inmo.krontab.builder.buildSchedule
+import dev.inmo.krontab.next
+import kotlin.test.Test
+import kotlin.test.assertEquals
+
+class TimeZoneTest {
+    @Test
+    fun testDifferentTimeZonesReturnsDifferentTimes() {
+        val scheduler = buildSchedule { seconds { every(1) } }
+        val baseDate = DateTime.now().startOfWeek
+        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).utc.unixMillisLong, next.utc.unixMillisLong
+                    )
+                }
+            }
+        }
+    }
+}

src/commonTest/kotlin/dev/inmo/krontab/utils/WeekDaysTest.kt

@@ -0,0 +1,38 @@
+package dev.inmo.krontab.utils
+
+import com.soywiz.klock.*
+import dev.inmo.krontab.builder.buildSchedule
+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)
+                }
+            }
+        }
+    }
+}