Below are few good resources for finding out the Cron job expressions. There is also a problem that depending on the version of the Camunda engine, the support for these cron expressions are limited.
It might throw errors like this below.
NGINE-09026 Exception while parsing cron expression '0 0 * * * MON': Support for specifying both a day-of-week AND a day-of-month parameter is not implemented. [ deploy-error ]
ENGINE-09026 Exception while parsing cron expression '0 0 * ? ? MON': '?' can only be specfied for Day-of-Month or Day-of-Week. [ deploy-error ]
ENGINE-09026 Exception while parsing cron expression '* * * * * 1': Support for specifying both a day-of-week AND a day-of-month parameter is not implemented. [ deploy-error ]
ENGINE-09026 Exception while parsing cron expression '* * * * * 1': Support for specifying both a day-of-week AND a day-of-month parameter is not implemented. [ deploy-error ]
ENGINE-09026 Exception while parsing cron expression '* * * * * MON': Support for specifying both a day-of-week AND a day-of-month parameter is not implemented. [ deploy-error ]
https://www.freeformatter.com/cron-expression-generator-quartz.html
https://crontab.guru/every-week
https://github.com/camunda/zeebe/issues/9673
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