min hr day-of-month month day-of-week
* * * * *
0-59 0-23 1-31 1-12 0-6 (0=Sun)| Expression | Meaning |
|---|---|
0 9 * * * | Every day at 9:00. |
0 9 * * 1 | Every Monday at 9:00. |
*/15 * * * * | Every 15 minutes. |
0 0 1 * * | First of every month at midnight. |
0 7-19 * * 1-5 | Hourly 7am–7pm, Mon–Fri. |
Tip. The routine editor has a live human-readable preview — type a cron and it shows the next 3 fire times so you can sanity-check.