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cron

Cron expression parser and evaluator.

Allows for specifying cron - expressions (in Unix or Quartz like format) and evaluating when it will next match.

Modules

  • cron-jodatime: Based on jodatime. Supports java6
  • cron-java8: Based on java8/time. Requires java8+

Usage

See javadoc

Change history and credits

version 1.6:

  • 2020-11-05: fix issue #7 for java8 Switching Month/Year with given Month fails on nextTimeAfter by @foto-andreas

version 1.5:

  • 2019-08-02: performance improvement when next time is further into the future (java8) by @n3world

version 1.4:

  • 2017-02-13: added support for java6 (supports android 4) by @adelnizamutdinov
  • 2016-09-11: rewritten to Java 8 DateTime by @zemiak

version 1.3:

  • 2015-09-23: added timezone to tests by @alf

version 1.2:

  • 2015-08-05: added protection for endless loop when looking up Feb 30th & optional seconds by @michaelknigge

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cron's Issues

Switching Month/Year with given Month fails on nextTimeAfter

Hi,

there is a bug in the lib when cron switches to next month and a fixed month is set in the cron expression. Here are some unit tests which show the problem. Instead of switching to 00:50 the calculated time is 23:50.

    public void testSPSTriggerProblemSameMonth() {
        assertEquals(ZonedDateTime.parse("2020-01-02T00:50:00Z"),
            new CronExpression("00 50 * 1-8 1 *")
                .nextTimeAfter(ZonedDateTime.parse("2020-01-01T23:50:00Z")));
    }

    public void testSPSTriggerProblemNextMonth() {
        assertEquals(ZonedDateTime.parse("2020-02-01T00:50:00Z"),
            new CronExpression("00 50 * 1-8 2 *")
                .nextTimeAfter(ZonedDateTime.parse("2020-01-31T23:50:00Z")));
    }

    public void testSPSTriggerProblemNextYear() {
        assertEquals(ZonedDateTime.parse("2020-01-01T00:50:00Z"),
            new CronExpression("00 50 * 1-8 1 *")
                .nextTimeAfter(ZonedDateTime.parse("2019-12-31T23:50:00Z")));
    }

    public void testSPSTriggerProblemNextMonthMonthAst() {
        assertEquals(ZonedDateTime.parse("2020-02-01T00:50:00Z"),
            new CronExpression("00 50 * 1-8 * *")
                .nextTimeAfter(ZonedDateTime.parse("2020-01-31T23:50:00Z")));
    }

    public void testSPSTriggerProblemNextYearMonthAst() {
        assertEquals(ZonedDateTime.parse("2020-01-01T00:50:00Z"),
            new CronExpression("00 50 * 1-8 * *")
                .nextTimeAfter(ZonedDateTime.parse("2019-12-31T23:50:00Z")));
    }

    public void testSPSTriggerProblemNextMonthDayAst() {
        assertEquals(ZonedDateTime.parse("2020-02-01T00:50:00Z"),
            new CronExpression("00 50 * * 2 *")
                .nextTimeAfter(ZonedDateTime.parse("2020-01-31T23:50:00Z")));
    }

    public void testSPSTriggerProblemNextYearDayAst() {
        assertEquals(ZonedDateTime.parse("2020-01-01T00:50:00Z"),
            new CronExpression("00 50 * * 1 *")
                .nextTimeAfter(ZonedDateTime.parse("2019-12-31T23:50:00Z")));
    }

    public void testSPSTriggerProblemNextMonthAllAst() {
        assertEquals(ZonedDateTime.parse("2020-02-01T00:50:00Z"),
            new CronExpression("00 50 * * * *")
                .nextTimeAfter(ZonedDateTime.parse("2020-01-31T23:50:00Z")));
    }

    public void testSPSTriggerProblemNextYearAllAst() {
        assertEquals(ZonedDateTime.parse("2020-01-01T00:50:00Z"),
            new CronExpression("00 50 * * * *")
                .nextTimeAfter(ZonedDateTime.parse("2019-12-31T23:50:00Z")));
    }

The failing tests are:

testSPSTriggerProblemNextMonth
testSPSTriggerProblemNextYear
testSPSTriggerProblemNextMonthDayAst
testSPSTriggerProblemNextYearDayAst

I checked with v1.5 and v1.4.

Cheers Andreas

Year support

Is it possible to add year support as seventh field of cron expression?

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