Cron Syntax
Cron syntax is used to schedule when automated build flows should run.
Cron scheduling uses a series of five numbers, separated by spaces. Each field is a number or a wildcard:
# ┌───────────── minute (0 - 59)
# │ ┌───────────── hour (0 - 23)
# │ │ ┌───────────── day of the month (1 - 31)
# │ │ │ ┌───────────── month (1 - 12)
# │ │ │ │ ┌───────────── day of the week (0 - 6) (Sunday to Saturday)
# │ │ │ │ │
# │ │ │ │ │
# │ │ │ │ │
# * * * * * <command to execute>
In cron syntax, the asterisk (*) means ‘every’. Here are some common examples:
| Entry | Description | Equivalent to |
|---|---|---|
| monthly | Run once a month at midnight of the first day of the month | 0 0 1 * * |
| monthly on the 22nd | Run once a month on the 22nd | 0 0 22 * * |
| weekly | Run once a week at midnight on Sunday | 0 0 * * 0 |
| daily or midnight | Run once a day at midnight | 0 0 * * * |
| daily at 7:00pm | Run once a day at 7:00pm | 0 19 * * * |
| hourly | Run once an hour at the beginning of the hour | 0 * * * * |
References:
More details can be found on Wikipedia.
Additional examples can be found on https://crontab.guru/examples.html
A cron calculator: https://crontab.guru/
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