Cron: every 3 hours

0 */3 * * *: On the hour, every 3 hours.

Cron expression

Meaning

Examples

Other common schedules

Seconds

Every 10 seconds */10 * * * * *
Every 30 seconds */30 * * * * *

Minutes

Every minute * * * * *
Every 2 minutes */2 * * * *
Every 5 minutes */5 * * * *
Every 10 minutes */10 * * * *
Every 15 minutes */15 * * * *
Every 20 minutes */20 * * * *
Every 30 minutes */30 * * * *

Hours

Every hour 0 * * * *
Every 2 hours 0 */2 * * *
Every 3 hours 0 */3 * * *
Every 4 hours 0 */4 * * *
Every 6 hours 0 */6 * * *
Every 8 hours 0 */8 * * *
Every 12 hours 0 */12 * * *
Every hour, 9am–5pm on weekdays 0 9-17 * * 1-5

Days

Every day at midnight 0 0 * * *
Every day at 1am 0 1 * * *
Every day at 2am 0 2 * * *
Every day at 6am 0 6 * * *
Every day at 8am 0 8 * * *
Every day at 9am 0 9 * * *
Every day at noon 0 12 * * *
Every day at 5pm 0 17 * * *
Every day at 6pm 0 18 * * *
Twice a day 0 0,12 * * *
Every other day 0 0 */2 * *

Weeks

Every weekday at 9am 0 9 * * 1-5
Every Saturday and Sunday 0 0 * * 6,0
Every week 0 0 * * 0
Every Monday 0 0 * * 1
Every Friday 0 0 * * 5
Every Saturday 0 0 * * 6

Months and years

Every month 0 0 1 * *
On the 15th of every month 0 0 15 * *
Every quarter 0 0 1 */3 *
Every 6 months 0 0 1 */6 *
Every year 0 0 1 1 *