Spring Cron Expression for Every Day 1:01:Am

Spring Cron expression every 15 mins for particular hours and not running on days

You can declare analytically what you want in such a complex scenario. The following should work.

@Scheduled(cron = "0 0/15 0,1,2,3,4,5,6,22,23 1,2,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,26,27,28,29,30,31 * ? *")

Or you can summarize it a bit into

@Scheduled(cron = "0 0/15 0-6,22-23 1,2,4-24,26-31 * ? *")

For hour 24 is represented as 0

Spring cron scheduler for every 59 seconds do double run

I think there is a bug in the scheduler.

With the following test code You will see that 2 schedules occur when the current time is in the second 59 on in second 00.

  Set<String> x = new HashSet<>();
    List<LocalDateTime> y = new ArrayList<>();
    while (true) {

      var expression = CronExpression.parse("*/59 * 9-21 * * *");
      final LocalDateTime now = LocalDateTime.now();
      y.add(now);
      x.add(expression.next(now).toString());
      System.out.println(x);
      Thread.sleep(500);

      if (x.size() > 2){
        break;
      }
    }

    System.out.println(x);

I obtained 3 results

[2022-02-09T15:58:59, 2022-02-09T15:59:59, 2022-02-09T15:59]

For the following dates:

I've tested this with Spring Boot version 2.6.3.

Spring cron expression for every after 30 minutes

<property name="cronExpression" value="0 0/30 * * * ?" />

“First Wednesday of the month at 9 AM” in cron?

You can use this syntax

0 9 1W * *

1W will specify the first Wednesday of the month.

The answer below does not appear to work (at least according to some online tools)

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You can take advantage of the ability to specify multiple days in the 3rd parameter, like this:

0 9 1-7 * 3

Trying the expression in https://crontab.cronhub.io/, this is how the above gets described:

At 09:00 AM, between day 1 and 7 of the month, and on Wednesday

You can be sure that one and only one of the first 7 days of the month will be Wednesday, and is also the first Wednesday of the month.

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