Run a Cron Job on the 15th of Every Month

To run a job on the 15th of every month, set the day-of-month field to 15: 0 0 15 * * runs at midnight on the 15th.

Cron expression (minute hour day-of-month month day-of-week)

The expression

0 0 15 * * runs at 00:00 on the 15th of every month. Fields: minute (0), hour (0), day-of-month (15), month (*), day-of-week (*).

Change the first two fields for the hour. 0 9 15 * * runs at 09:00 on the 15th.

List both days with a comma: 0 0 1,15 * * runs at midnight on the 1st and the 15th — a common semi-monthly / payroll cadence.

0 0 15 * * runs at midnight on the 15th of every month. The 15 is the day-of-month field.

Change the minute and hour fields, e.g. 0 9 15 * * runs at 09:00 on the 15th.

Use a comma list in the day-of-month field: 0 0 1,15 * * runs on the 1st and 15th at midnight.