Cron for every 45 minutes

A common mistake: 45 does not divide 60, so this fires at :00 and :45 and then waits only 15 minutes. Standard cron cannot express a true 45-minute interval.

*/45 * * * *

Every 45 minutes

Interpreted in UTC · approximately 48 runs per day

Things to check

Gotcha
Step of 45 does not divide 60 minutes evenly
"*/45" fires at 0 and 45 and last at 45. Because 45 does not divide 60 evenly, the interval from 45 back around to 0 is 15, not 45. The schedule is not truly "every 45 minutes".
Fix: Use a step that divides 60 evenly, or list the values explicitly.

Fields

Minute*/45: Every 45 minutes.
Hour*: Every hour.
Day of month*: Every day of the month.
Month*: Every month.
Day of week*: Every day of the week.

Next runs

Wed, 2026-09-02, 16:002026-09-02T16:00:00.000Z
Wed, 2026-09-02, 16:452026-09-02T16:45:00.000Z
Wed, 2026-09-02, 17:002026-09-02T17:00:00.000Z
Wed, 2026-09-02, 17:452026-09-02T17:45:00.000Z
Wed, 2026-09-02, 18:002026-09-02T18:00:00.000Z
Wed, 2026-09-02, 18:452026-09-02T18:45:00.000Z
Wed, 2026-09-02, 19:002026-09-02T19:00:00.000Z
Wed, 2026-09-02, 19:452026-09-02T19:45:00.000Z

Try a different expression or timezone

Times above are in UTC. Pick a timezone here to see this schedule in local time.

Call this from code or an agent

curl 'https://crontoenglish.com/api/v1/explain?expression=*%2F45%20*%20*%20*%20*'

API and MCP setup · this page as markdown