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Expressions are used to configure the schedule of tasks. Expressions are strings that are actually made up of seven sub-expressions, that describe individual details of the schedule. These sub-expression are separated with white-space, and represent:
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| Name | Required | Allowed Values | Allowed Special Characters |
|---|---|---|---|
Seconds | Y | 0-59 | , - * / |
Minutes | Y | 0-59 | , - * / |
Hours | Y | 0-23 | , - * / |
Day of month | Y | 1-31 | , - * ? / L W C |
Month | Y | 0-11 or JAN-DEC | , - * / |
Day of week | Y | 1-7 or SUN-SAT | , - * ? / L C # |
Year | N | empty or 1970-2099 | , - * / |
An example of a complete cron-expression is the string "0 0 12 ? * WED" - which means "every Wednesday at 12:00 pm".
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The '#' is used to specify "the nth" XXX weekday of the month. For example, the value of "6#3" or "FRI#3" in the day-of-week field means "the third Friday of the month".
Helpful Tool
crontab.guru is a useful tool that will help you create cron schedule expressions. If you are new to using cron expressions, we highly recommend you take a look at this tool.
Example Expressions
Here are a few more examples of expressions and their meanings.
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