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Describing
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<a href="describing/krontabscheduler.html" class="md-nav__link">
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KrontabScheduler
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KSLog
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<span class="md-nav__icon md-icon"></span>
</label>
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KSLog
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<li class="md-nav__item">
<a href="https://kslog.inmo.dev/" class="md-nav__link">
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KDocs
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Setup
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Getting started (TBD)
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Services
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Including in project
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Config from string
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Config via builder
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KronScheduler as a Flow
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Offsets
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Note about week days
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<a href="https://github.com/InsanusMokrassar/docs/edit/master/docs/krontab/index.md" title="Edit this page" class="md-content__button md-icon">
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<h1 id="krontab">krontab<a class="headerlink" href="#krontab" title="Permanent link">&para;</a></h1>
<p><a href="https://maven-badges.herokuapp.com/maven-central/dev.inmo/krontab"><img alt="Maven Central" src="https://maven-badges.herokuapp.com/maven-central/dev.inmo/krontab/badge.svg" /></a></p>
<p><a href="https://inmodev_chat.t.me"><img alt="Telegram Chat" src="https://img.shields.io/badge/Telegram%20Chat-0288D1?style=for-the-badge&amp;logo=telegram&amp;logoColor=white" /></a></p>
<p><img alt="JVM" src="https://img.shields.io/badge/JVM-red?style=for-the-badge&amp;logo=openjdk&amp;logoColor=white" />
<img alt="Android" src="https://img.shields.io/badge/Android-green?style=for-the-badge&amp;logo=android&amp;logoColor=white" />
<img alt="Js" src="https://img.shields.io/badge/JavaScript-323330?style=for-the-badge&amp;logo=javascript&amp;logoColor=F7DF1E" />
<img alt="Linux x64" src="https://img.shields.io/badge/Linux%20x64-white?style=for-the-badge&amp;logo=linux&amp;logoColor=black" /></p>
<p><a href="https://insanusmokrassar.github.io/krontab/"><img alt="KDocs" src="https://img.shields.io/badge/KDocs-323330?style=for-the-badge&amp;logo=Kotlin&amp;logoColor=7F52FF" /></a></p>
<p>Library was created to give opportunity to launch some things from time to time according to some schedule in
runtime of applications.</p>
<h2 id="how-to-use">How to use<a class="headerlink" href="#how-to-use" title="Permanent link">&para;</a></h2>
<p><strong><a href="https://insanusmokrassar.github.io/KrontabPredictor">Here</a> you may find the builder for <code>Krontab</code> templates creation.</strong></p>
<p>There are several ways to configure and use this library:</p>
<ul>
<li>From some string</li>
<li>From builder</li>
</ul>
<p>Anyway, to start some action from time to time you will need to use one of extensions/functions:</p>
<div class="language-kotlin highlight"><pre><span></span><code><span id="__span-0-1"><a id="__codelineno-0-1" name="__codelineno-0-1" href="#__codelineno-0-1"></a><span class="kd">val</span><span class="w"> </span><span class="nv">kronScheduler</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="cm">/* creating of KronScheduler instance */</span><span class="p">;</span>
</span><span id="__span-0-2"><a id="__codelineno-0-2" name="__codelineno-0-2" href="#__codelineno-0-2"></a>
</span><span id="__span-0-3"><a id="__codelineno-0-3" name="__codelineno-0-3" href="#__codelineno-0-3"></a><span class="n">kronScheduler</span><span class="p">.</span><span class="na">doWhile</span><span class="w"> </span><span class="p">{</span>
</span><span id="__span-0-4"><a id="__codelineno-0-4" name="__codelineno-0-4" href="#__codelineno-0-4"></a><span class="w"> </span><span class="c1">// some action</span>
</span><span id="__span-0-5"><a id="__codelineno-0-5" name="__codelineno-0-5" href="#__codelineno-0-5"></a><span class="w"> </span><span class="kc">true</span><span class="w"> </span><span class="c1">// true - repeat on next time</span>
</span><span id="__span-0-6"><a id="__codelineno-0-6" name="__codelineno-0-6" href="#__codelineno-0-6"></a><span class="p">}</span>
</span></code></pre></div>
<h3 id="including-in-project">Including in project<a class="headerlink" href="#including-in-project" title="Permanent link">&para;</a></h3>
<p>If you want to include <code>krontab</code> in your project, just add next line to your
dependencies part:</p>
<div class="language-groovy highlight"><pre><span></span><code><span id="__span-1-1"><a id="__codelineno-1-1" name="__codelineno-1-1" href="#__codelineno-1-1"></a><span class="n">implementation</span><span class="w"> </span><span class="s2">&quot;dev.inmo:krontab:$krontab_version&quot;</span>
</span></code></pre></div>
<p>Next version is the latest currently for the library:</p>
<p><a href="https://maven-badges.herokuapp.com/maven-central/dev.inmo/krontab"><img alt="Maven Central" src="https://maven-badges.herokuapp.com/maven-central/dev.inmo/krontab/badge.svg" /></a></p>
<p>For old version of Gradle, instead of <code>implementation</code> word developers must use <code>compile</code>.</p>
<h3 id="config-from-string">Config from string<a class="headerlink" href="#config-from-string" title="Permanent link">&para;</a></h3>
<p>Developers can use more simple way to configure repeat times is string. String configuring
like a <code>crontab</code>, but with a little bit different meanings:</p>
<div class="language-text highlight"><pre><span></span><code><span id="__span-2-1"><a id="__codelineno-2-1" name="__codelineno-2-1" href="#__codelineno-2-1"></a>/--------------- Seconds
</span><span id="__span-2-2"><a id="__codelineno-2-2" name="__codelineno-2-2" href="#__codelineno-2-2"></a>| /------------- Minutes
</span><span id="__span-2-3"><a id="__codelineno-2-3" name="__codelineno-2-3" href="#__codelineno-2-3"></a>| | /----------- Hours
</span><span id="__span-2-4"><a id="__codelineno-2-4" name="__codelineno-2-4" href="#__codelineno-2-4"></a>| | | /--------- Days of months
</span><span id="__span-2-5"><a id="__codelineno-2-5" name="__codelineno-2-5" href="#__codelineno-2-5"></a>| | | | /------- Months
</span><span id="__span-2-6"><a id="__codelineno-2-6" name="__codelineno-2-6" href="#__codelineno-2-6"></a>| | | | | /----- (optional) Year
</span><span id="__span-2-7"><a id="__codelineno-2-7" name="__codelineno-2-7" href="#__codelineno-2-7"></a>| | | | | | /--- (optional) Timezone offset
</span><span id="__span-2-8"><a id="__codelineno-2-8" name="__codelineno-2-8" href="#__codelineno-2-8"></a>| | | | | | | / (optional) Week days
</span><span id="__span-2-9"><a id="__codelineno-2-9" name="__codelineno-2-9" href="#__codelineno-2-9"></a>* * * * * * 0o *w
</span></code></pre></div>
<p>It is different with original <code>crontab</code> syntax for the reason, that expected that in practice developers
will use seconds and minutes with more probability than months (for example) or even years. In fact, developers will use
something like:</p>
<div class="language-kotlin highlight"><pre><span></span><code><span id="__span-3-1"><a id="__codelineno-3-1" name="__codelineno-3-1" href="#__codelineno-3-1"></a><span class="n">doWhile</span><span class="p">(</span><span class="s">&quot;/5 * * * *&quot;</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
</span><span id="__span-3-2"><a id="__codelineno-3-2" name="__codelineno-3-2" href="#__codelineno-3-2"></a><span class="w"> </span><span class="n">println</span><span class="p">(</span><span class="s">&quot;Called&quot;</span><span class="p">)</span>
</span><span id="__span-3-3"><a id="__codelineno-3-3" name="__codelineno-3-3" href="#__codelineno-3-3"></a><span class="w"> </span><span class="kc">true</span><span class="w"> </span><span class="c1">// true - repeat on next time</span>
</span><span id="__span-3-4"><a id="__codelineno-3-4" name="__codelineno-3-4" href="#__codelineno-3-4"></a><span class="p">}</span>
</span></code></pre></div>
<p>Another version:</p>
<div class="language-kotlin highlight"><pre><span></span><code><span id="__span-4-1"><a id="__codelineno-4-1" name="__codelineno-4-1" href="#__codelineno-4-1"></a><span class="n">doInfinity</span><span class="p">(</span><span class="s">&quot;/5 * * * *&quot;</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
</span><span id="__span-4-2"><a id="__codelineno-4-2" name="__codelineno-4-2" href="#__codelineno-4-2"></a><span class="w"> </span><span class="n">println</span><span class="p">(</span><span class="s">&quot;Called&quot;</span><span class="p">)</span>
</span><span id="__span-4-3"><a id="__codelineno-4-3" name="__codelineno-4-3" href="#__codelineno-4-3"></a><span class="p">}</span>
</span></code></pre></div>
<p>Both of examples will print <code>Called</code> message every five seconds.</p>
<h3 id="config-via-builder">Config via builder<a class="headerlink" href="#config-via-builder" title="Permanent link">&para;</a></h3>
<p>Also, this library currently supports DSL for creating the same goals:</p>
<div class="language-kotlin highlight"><pre><span></span><code><span id="__span-5-1"><a id="__codelineno-5-1" name="__codelineno-5-1" href="#__codelineno-5-1"></a><span class="kd">val</span><span class="w"> </span><span class="nv">kronScheduler</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">buildSchedule</span><span class="w"> </span><span class="p">{</span>
</span><span id="__span-5-2"><a id="__codelineno-5-2" name="__codelineno-5-2" href="#__codelineno-5-2"></a><span class="w"> </span><span class="n">seconds</span><span class="w"> </span><span class="p">{</span>
</span><span id="__span-5-3"><a id="__codelineno-5-3" name="__codelineno-5-3" href="#__codelineno-5-3"></a><span class="w"> </span><span class="n">from</span><span class="w"> </span><span class="p">(</span><span class="m">0</span><span class="p">)</span><span class="w"> </span><span class="n">every</span><span class="w"> </span><span class="m">5</span>
</span><span id="__span-5-4"><a id="__codelineno-5-4" name="__codelineno-5-4" href="#__codelineno-5-4"></a><span class="w"> </span><span class="p">}</span>
</span><span id="__span-5-5"><a id="__codelineno-5-5" name="__codelineno-5-5" href="#__codelineno-5-5"></a><span class="p">}</span>
</span><span id="__span-5-6"><a id="__codelineno-5-6" name="__codelineno-5-6" href="#__codelineno-5-6"></a><span class="n">kronScheduler</span><span class="p">.</span><span class="na">doWhile</span><span class="w"> </span><span class="p">{</span>
</span><span id="__span-5-7"><a id="__codelineno-5-7" name="__codelineno-5-7" href="#__codelineno-5-7"></a><span class="w"> </span><span class="n">println</span><span class="p">(</span><span class="s">&quot;Called&quot;</span><span class="p">)</span>
</span><span id="__span-5-8"><a id="__codelineno-5-8" name="__codelineno-5-8" href="#__codelineno-5-8"></a><span class="w"> </span><span class="kc">true</span><span class="w"> </span><span class="c1">// true - repeat on next time</span>
</span><span id="__span-5-9"><a id="__codelineno-5-9" name="__codelineno-5-9" href="#__codelineno-5-9"></a><span class="p">}</span>
</span></code></pre></div>
<p>Or</p>
<div class="language-kotlin highlight"><pre><span></span><code><span id="__span-6-1"><a id="__codelineno-6-1" name="__codelineno-6-1" href="#__codelineno-6-1"></a><span class="kd">val</span><span class="w"> </span><span class="nv">kronScheduler</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">buildSchedule</span><span class="w"> </span><span class="p">{</span>
</span><span id="__span-6-2"><a id="__codelineno-6-2" name="__codelineno-6-2" href="#__codelineno-6-2"></a><span class="w"> </span><span class="n">seconds</span><span class="w"> </span><span class="p">{</span>
</span><span id="__span-6-3"><a id="__codelineno-6-3" name="__codelineno-6-3" href="#__codelineno-6-3"></a><span class="w"> </span><span class="m">0</span><span class="w"> </span><span class="n">every</span><span class="w"> </span><span class="m">5</span>
</span><span id="__span-6-4"><a id="__codelineno-6-4" name="__codelineno-6-4" href="#__codelineno-6-4"></a><span class="w"> </span><span class="p">}</span>
</span><span id="__span-6-5"><a id="__codelineno-6-5" name="__codelineno-6-5" href="#__codelineno-6-5"></a><span class="p">}</span>
</span><span id="__span-6-6"><a id="__codelineno-6-6" name="__codelineno-6-6" href="#__codelineno-6-6"></a><span class="n">kronScheduler</span><span class="p">.</span><span class="na">doWhile</span><span class="w"> </span><span class="p">{</span>
</span><span id="__span-6-7"><a id="__codelineno-6-7" name="__codelineno-6-7" href="#__codelineno-6-7"></a><span class="w"> </span><span class="n">println</span><span class="p">(</span><span class="s">&quot;Called&quot;</span><span class="p">)</span>
</span><span id="__span-6-8"><a id="__codelineno-6-8" name="__codelineno-6-8" href="#__codelineno-6-8"></a><span class="w"> </span><span class="kc">true</span><span class="w"> </span><span class="c1">// true - repeat on next time</span>
</span><span id="__span-6-9"><a id="__codelineno-6-9" name="__codelineno-6-9" href="#__codelineno-6-9"></a><span class="p">}</span>
</span></code></pre></div>
<p>Or</p>
<div class="language-kotlin highlight"><pre><span></span><code><span id="__span-7-1"><a id="__codelineno-7-1" name="__codelineno-7-1" href="#__codelineno-7-1"></a><span class="kd">val</span><span class="w"> </span><span class="nv">kronScheduler</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">buildSchedule</span><span class="w"> </span><span class="p">{</span>
</span><span id="__span-7-2"><a id="__codelineno-7-2" name="__codelineno-7-2" href="#__codelineno-7-2"></a><span class="w"> </span><span class="n">seconds</span><span class="w"> </span><span class="p">{</span>
</span><span id="__span-7-3"><a id="__codelineno-7-3" name="__codelineno-7-3" href="#__codelineno-7-3"></a><span class="w"> </span><span class="m">0</span><span class="w"> </span><span class="n">every</span><span class="w"> </span><span class="m">5</span>
</span><span id="__span-7-4"><a id="__codelineno-7-4" name="__codelineno-7-4" href="#__codelineno-7-4"></a><span class="w"> </span><span class="p">}</span>
</span><span id="__span-7-5"><a id="__codelineno-7-5" name="__codelineno-7-5" href="#__codelineno-7-5"></a><span class="p">}</span>
</span><span id="__span-7-6"><a id="__codelineno-7-6" name="__codelineno-7-6" href="#__codelineno-7-6"></a><span class="n">kronScheduler</span><span class="p">.</span><span class="na">doInfinity</span><span class="w"> </span><span class="p">{</span>
</span><span id="__span-7-7"><a id="__codelineno-7-7" name="__codelineno-7-7" href="#__codelineno-7-7"></a><span class="w"> </span><span class="n">println</span><span class="p">(</span><span class="s">&quot;Called&quot;</span><span class="p">)</span>
</span><span id="__span-7-8"><a id="__codelineno-7-8" name="__codelineno-7-8" href="#__codelineno-7-8"></a><span class="p">}</span>
</span></code></pre></div>
<p>All of these examples will do the same things: print <code>Called</code> message every five seconds.</p>
<h3 id="do-functions">do* functions<a class="headerlink" href="#do-functions" title="Permanent link">&para;</a></h3>
<p>With regular <code>doOnce</code>/<code>doWhile</code>/<code>doInfinity</code> there are two types of their variations: <strong>local</strong> and <strong>timezoned</strong>. Local
variations (<code>doOnceLocal</code>/<code>doWhileLocal</code>/<code>doInfinityLocal</code>) will pass <code>DateTime</code> as an argument into the block:</p>
<div class="language-kotlin highlight"><pre><span></span><code><span id="__span-8-1"><a id="__codelineno-8-1" name="__codelineno-8-1" href="#__codelineno-8-1"></a><span class="n">doInfinityLocal</span><span class="p">(</span><span class="s">&quot;/5 * * * *&quot;</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
</span><span id="__span-8-2"><a id="__codelineno-8-2" name="__codelineno-8-2" href="#__codelineno-8-2"></a><span class="w"> </span><span class="n">println</span><span class="p">(</span><span class="nb">it</span><span class="p">)</span><span class="w"> </span><span class="c1">// will print current date time</span>
</span><span id="__span-8-3"><a id="__codelineno-8-3" name="__codelineno-8-3" href="#__codelineno-8-3"></a><span class="p">}</span>
</span></code></pre></div>
<p>Timezoned variations (<code>doOnceTz</code>/<code>doWhileTz</code>/<code>doInfinityTz</code>) will do the same thing but pass as an argument <code>DateTimeTz</code>:</p>
<div class="language-kotlin highlight"><pre><span></span><code><span id="__span-9-1"><a id="__codelineno-9-1" name="__codelineno-9-1" href="#__codelineno-9-1"></a><span class="n">doInfinityTz</span><span class="p">(</span><span class="s">&quot;/5 * * * * 0o&quot;</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
</span><span id="__span-9-2"><a id="__codelineno-9-2" name="__codelineno-9-2" href="#__codelineno-9-2"></a><span class="w"> </span><span class="n">println</span><span class="p">(</span><span class="nb">it</span><span class="p">)</span><span class="w"> </span><span class="c1">// will print current date time in UTC</span>
</span><span id="__span-9-3"><a id="__codelineno-9-3" name="__codelineno-9-3" href="#__codelineno-9-3"></a><span class="p">}</span>
</span></code></pre></div>
<p>It is useful in cases when you need to get the time of calling and avoid extra calls to system time.</p>
<h4 id="helpful-table-for">Helpful table for<a class="headerlink" href="#helpful-table-for" title="Permanent link">&para;</a></h4>
<table>
<thead>
<tr>
<th></th>
<th>No args</th>
<th>Local <code>DateTime</code></th>
<th>Local <code>DateTimeTz</code> with offset of <code>KronScheduler</code></th>
</tr>
</thead>
<tbody>
<tr>
<td><strong>Call only near time</strong></td>
<td>doOnce</td>
<td>doOnceLocal</td>
<td>doOnceTz</td>
</tr>
<tr>
<td><strong>Call while condition is true</strong></td>
<td>doWhile</td>
<td>doWhileLocal</td>
<td>doWhileTz</td>
</tr>
<tr>
<td><strong>Work infinity</strong>*</td>
<td>doInfinity</td>
<td>doInfinityLocal</td>
<td>doInfinityTz</td>
</tr>
</tbody>
</table>
<p>*Here there is an important notice, that <code>Work infinity</code> is not exactly <code>infinity</code>. Actually, that means that <code>do while
coroutine is alive</code> and in fact executing will be stopped when coroutine became cancelled.</p>
<h3 id="kronscheduler-as-a-flow">KronScheduler as a Flow<a class="headerlink" href="#kronscheduler-as-a-flow" title="Permanent link">&para;</a></h3>
<p>Any <code>KronScheduler</code> can be converted to a <code>Flow&lt;DateTime&gt;</code> using extension <code>asFlow</code>:</p>
<div class="language-kotlin highlight"><pre><span></span><code><span id="__span-10-1"><a id="__codelineno-10-1" name="__codelineno-10-1" href="#__codelineno-10-1"></a><span class="kd">val</span><span class="w"> </span><span class="nv">kronScheduler</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">buildSchedule</span><span class="w"> </span><span class="p">{</span>
</span><span id="__span-10-2"><a id="__codelineno-10-2" name="__codelineno-10-2" href="#__codelineno-10-2"></a><span class="w"> </span><span class="n">seconds</span><span class="w"> </span><span class="p">{</span>
</span><span id="__span-10-3"><a id="__codelineno-10-3" name="__codelineno-10-3" href="#__codelineno-10-3"></a><span class="w"> </span><span class="m">0</span><span class="w"> </span><span class="n">every</span><span class="w"> </span><span class="m">1</span>
</span><span id="__span-10-4"><a id="__codelineno-10-4" name="__codelineno-10-4" href="#__codelineno-10-4"></a><span class="w"> </span><span class="p">}</span>
</span><span id="__span-10-5"><a id="__codelineno-10-5" name="__codelineno-10-5" href="#__codelineno-10-5"></a><span class="p">}</span>
</span><span id="__span-10-6"><a id="__codelineno-10-6" name="__codelineno-10-6" href="#__codelineno-10-6"></a>
</span><span id="__span-10-7"><a id="__codelineno-10-7" name="__codelineno-10-7" href="#__codelineno-10-7"></a><span class="kd">val</span><span class="w"> </span><span class="nv">flow</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">kronScheduler</span><span class="p">.</span><span class="na">asFlow</span><span class="p">()</span>
</span></code></pre></div>
<p>So, in this case any operations related to flow are available, and it is expected that they will work correctly. For
example, it is possible to use this flow with <code>takeWhile</code>:</p>
<div class="language-kotlin highlight"><pre><span></span><code><span id="__span-11-1"><a id="__codelineno-11-1" name="__codelineno-11-1" href="#__codelineno-11-1"></a><span class="n">flow</span><span class="p">.</span><span class="na">takeWhile</span><span class="w"> </span><span class="p">{</span>
</span><span id="__span-11-2"><a id="__codelineno-11-2" name="__codelineno-11-2" href="#__codelineno-11-2"></a><span class="w"> </span><span class="n">condition</span><span class="p">()</span>
</span><span id="__span-11-3"><a id="__codelineno-11-3" name="__codelineno-11-3" href="#__codelineno-11-3"></a><span class="p">}.</span><span class="na">collect</span><span class="w"> </span><span class="p">{</span>
</span><span id="__span-11-4"><a id="__codelineno-11-4" name="__codelineno-11-4" href="#__codelineno-11-4"></a><span class="w"> </span><span class="n">action</span><span class="p">()</span>
</span><span id="__span-11-5"><a id="__codelineno-11-5" name="__codelineno-11-5" href="#__codelineno-11-5"></a><span class="p">}</span>
</span></code></pre></div>
<h3 id="offsets">Offsets<a class="headerlink" href="#offsets" title="Permanent link">&para;</a></h3>
<p>Offsets in this library works via passing parameter ending with <code>o</code> in any place after <code>month</code> config. Currently,
there is only one format supported for offsets: minutes of offsets. To use time zones you will need to call <code>next</code>
method with <code>DateTimeTz</code> argument or <code>nextTimeZoned</code> method with any <code>KronScheduler</code> instance, but in case if this
scheduler is not instance of <code>KronSchedulerTz</code> it will work like you passed just <code>DateTime</code>.</p>
<p>Besides, in case you wish to use time zones explicitly, you will need to get <code>KronSchedulerTz</code>. It is possible by:</p>
<ul>
<li>Using <code>createSimpleScheduler</code>/<code>buildSchedule</code>/<code>KrontabTemplate#toSchedule</code>/<code>KrontabTemplate#toKronScheduler</code> methods
with passing <code>defaultOffset</code> parameter</li>
<li>Using <code>SchedulerBuilder#build</code>/<code>createSimpleScheduler</code>/<code>buildSchedule</code>/<code>KrontabTemplate#toSchedule</code>/<code>KrontabTemplate#toKronScheduler</code>
methods with casting to <code>KronSchedulerTz</code> in case you are pretty sure that it is timezoned <code>KronScheduler</code></li>
<li>Creating your own implementation of <code>KronSchedulerTz</code></li>
</ul>
<h3 id="note-about-week-days">Note about week days<a class="headerlink" href="#note-about-week-days" title="Permanent link">&para;</a></h3>
<p>Unlike original CRON, here week days:</p>
<ul>
<li>Works as <code>AND</code>: cron date time will search first day which will pass requirement according all parameters including
week days</li>
<li>You may use any related to numbers syntax with week days: <code>0-3w</code>, <code>0,1,2,3w</code>, etc.</li>
<li>Week days (as well as years and offsets) are optional and can be placed anywhere after <code>month</code></li>
</ul>
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