cron job schedule change

[sai rama krishna]

I have cron job running daily at 8 am in my spring boot java micro service like below



app.scheduler.memberPlanExecution-DailyRun: '0 0 8 * * *'





Cron expression generator - Quartz
Use this online user interface to generate cron expressions based on the Quartz engine.

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I like to run at 8 AM, 1 PM, 4 PM, 6 PM daily. Instead of one tiome at 8 three more times during the day.

How to change my cron expression something like below?

app.scheduler.memberPlanExecution-DailyRun: '0 0 8/13/16/18 * * *'

or like below

app.scheduler.memberPlanExecution-DailyRun: '0 0 8^13^16^18 * * *'

or something else?

Please advise

[Tim Holloway]

Should be:

0 0 8,13,16,18 * * *

[sai rama krishna]

Thank you for the guidance. None of online documentation I could find this example in my search though. Everywhere they are examples of fixed intervals

[Tim Holloway]

The secret is to look up help on the cron command itself (crontab).  https://linux.die.net/man/5/crontab

[sai rama krishna]

That make lot of sense. Always better to go to source first

[sai rama krishna]

I need to change as below  8 AM, 1 PM, 4:30 PM, 6 PM daily.

Hope It should work as below right with : in between? Please advise


0 0 8,13,16:30,18 * * *

[Tim Holloway]

I have never seen such a construct. As far as I know, only simple integers (or day names) are valid as data points in a cron entry.

However, you should be able to simply add a second cron schedule for the off-time job. Like so:

 0   0  8,13,18 * * * 
 0 30          16 * * * 

Multiple cron schedules are a basic feature; the system cron often manages many unrelated jobs, each on their own schedule.

[sai rama krishna]

Thank you. I suggested to take int number rather than decimal number due to this challenge