Spring Scheduled tasks are not in the same format as cron expressions.

They don't follow the same format as UNIX cron expressions.

There are only 6 fields:

second,

minute,

hour,

day of month,

month,

day(s) of week.

Asterisk (*) means match any. */X means "every X" (see examples).

Numeric days of the week do not work for me. Besides, "MON-FRI" is much easier to read. Here are some example expressions:

"0 0 18 * * MON-FRI" means every weekday at 6:00 PM. 

"0 0 */1 * * *" means every hour on the hour.

"0 0 */8 * * *" means every 8 hours on the hour.

"0 0 12 1 * *" means 12:00 PM on the first day of every month. 

Here you can find some additional information.

Also you may find the spring documentation useful.

---

Taking some note from: https://www.baeldung.com/cron-expressions

A Spring Scheduled tasks is like this:

1 2 3 4 5 6 Index
- - - - - -
* * * * * * command to be executed
- - - - - -
| | | | | | 
| | | | | ------- Day of week (MON - SUN)
| | | | --------- Month (1 - 12)
| | | ----------- Day of month (1 - 31)
| |-------------- Hour (0 - 23)
| --------------- Minute (0 - 59)
----------------- Seconds (0 - 59)

From: https://www.cyberciti.biz/faq/how-do-i-add-jobs-to-cron-under-linux-or-unix-oses/

A Linux Cron job is like this:

1 2 3 4 5 Index
- - - - -
* * * * * command to be executed
- - - - -
| | | | |
| | | | ----- Day of week (0 - 7) (Sunday=0 or 7)
| | | ------- Month (1 - 12)
| | --------- Day of month (1 - 31)
| ----------- Hour (0 - 23)
------------- Minute (0 - 59)

Side note:

Some article said it is possible to have a 7 optional param which is year , I have tried using latest spring and it show error, so I don't think it is working.

If your Linux cron job expression is simple enough, seems like it is possible to just put an 0 in front and it will convert to the spring scheduled tasks expression E.g. Every 5 minutes */5 * * * * Linux cron job 0 */5 * * * * Spring schedule tasks

E.g. Every 5 minutes */5 * * * * Linux cron job 0 */5 * * * * Spring schedule tasks

*/5 * * * * Linux cron job

0 */5 * * * * Spring schedule tasks

Bonus: Spring Schedule Cron Generator

Click on Show code snippet Click on Run Code snippet Have fun!

$('.select2').select2({ width: '100%' }); //// Init //////////// $dropdown = $("#secondsSelect"); for (let i = 1; i < 60; i++) { $dropdown.append($("").val(i).text(i)); } $dropdown = $("#minSelect"); for (let i = 1; i < 60; i++) { $dropdown.append($("").val(i).text(i)); } $dropdown = $("#hoursSelect"); for (let i = 1; i < 24; i++) { $dropdown.append($("").val(i).text(i)); } $dropdown = $("#dayOfMonthSelect"); for (let i = 1; i < 32; i++) { $dropdown.append($("").val(i).text(i)); } //// Init End //////////// $('.select2').on('select2:select', function(e) { let value = e.params.data.id; let prevValue = $(this).val().length > 0 ? $(this).val()[0] : null; if (value != parseInt(value)) { $(this).val(value).change(); } else if (prevValue != parseInt(prevValue)) { $(this).val(value).change(); } calculateSpringCron(); }); let r = function(dropdown) { return dropdown.val().join(","); } let calculateSpringCron = function() { let result = [ r($("#secondsSelect")), r($("#minSelect")), r($("#hoursSelect")), r($("#dayOfMonthSelect")), r($("#monthsSelect")), r($("#weekdaySelect")), ]; $("#result").val(result.join(" ")); $("#result-expand").html(result.join("    ")) } calculateSpringCron(); .ms-container { display: flex; flex-direction: column; width: 100%; padding-left: 3em; padding-right: 3em; background: none !important; padding-bottom: 5em; }

---