Cron every 45 minutes
A common trap: */45 doesn't mean every 45 minutes. The step restarts every hour, so this runs at :00 and :45, 15 minutes apart and then 45. Cron can't express a true 45-minute interval; run every 15 minutes and skip runs in the script, or use a scheduler with fixed intervals.
At minutes 0 and 45 past every hour.
Next runs
What each field means
| Field | Value | Meaning |
|---|---|---|
| Minute | */45 | every 45th minute |
| Hour | * | every hour |
| Day of month | * | every day |
| Month | * | every month |
| Day of week | * | any day of the week |
Know when it doesn’t run
Cron never tells you when a job fails to start or dies halfway. Add a ping at the end of the line: if Heartcron doesn’t hear it on schedule, you get an alert in Telegram, Slack, Discord or email.
*/45 * * * * /path/to/job.sh && curl -fsS -m 10 --retry 3 https://ping.heartcron.com/<check-id> > /dev/nullCommon schedules
- every minute
* * * * * - every 2 minutes
*/2 * * * * - every 3 minutes
*/3 * * * * - every 5 minutes
*/5 * * * * - every 10 minutes
*/10 * * * * - every 15 minutes
*/15 * * * * - every 20 minutes
*/20 * * * * - every 30 minutes
*/30 * * * * - 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 day at midnight
0 0 * * * - every day at 3 AM
0 3 * * * - every day at 6 AM
0 6 * * * - every day at noon
0 12 * * * - every other day
0 0 */2 * * - twice a day
0 0,12 * * * - every weekday at 9 AM
0 9 * * 1-5 - every hour during business hours
0 9-17 * * 1-5 - every Monday
0 9 * * 1 - every Friday
0 17 * * 5 - on weekends
0 10 * * 6,0 - every week
0 0 * * 0 - every month
0 0 1 * * - on the 1st and 15th of the month
0 0 1,15 * * - every quarter
0 0 1 */3 * - every 6 months
0 0 1 */6 * - every year
0 0 1 1 * - Any other expression
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