Cron syntax

Read a quick reference to cron syntax and learn about the options that SRE.ai supports.

Allowed fields

 # ┌────────────── second (optional)
 # │ ┌──────────── minute
 # │ │ ┌────────── hour
 # │ │ │ ┌──────── day of month
 # │ │ │ │ ┌────── month
 # │ │ │ │ │ ┌──── day of week
 # │ │ │ │ │ │
 # │ │ │ │ │ │
 # * * * * * *

Allowed values

Field	Value
second	0-59
minute	0-59
hour	0-23
day of month	1-31
month	1-12 (or names)
day of week	0-7 (or names, 0 or 7 are Sunday)

Using multiple values

You may use multiple values separated by a comma. The following example runs every minute 1, 2, 4, and 5:

1,2,4,5 * * * *

Using ranges

You may define a range of values.

The following example runs every minute to 1 from 5:

1-5 * * * *

Using step values

You can use step values with ranges by following a range with '/' and a number. For example, writing 1-10/2 produces 2,4,6,8,10. You can also place steps after an asterisk, so to specify 'every two minutes,' use */2. The following example runs a task every two minutes:

*/2 * * * *

Using names

You can use names or short names for months and weekdays. The following example runs on Sundays in January and September:

* * * January,September Sunday

The following example uses short names and runs on Sundays in January and September:

* * * Jan,Sep Sun