How do I set up a cron job that runs every day at 1PM, 2PM and 3PM?

Use 0 13,14,15 * * *: an hour list runs at 13:00, 14:00 and 15:00 daily. 0 13-15 * * * is the equivalent range; different minutes need separate lines.

How can I run command every six hours every day?

Use 0 */6 * * *: four runs a day at 00:00, 06:00, 12:00 and 18:00, anchored at midnight. To shift the phase use a range, e.g. 0 3-23/6 * * * for 03/09/15/21.

I am trying to add a crontab entry to execute a script every 30 minutes, on the hour and 30 minutes past the hour or something similar. How can I do this?

Use 0,30 * * * * to run on the hour and at half past (48 runs a day), or 30 * * * * for half past only (24 runs). Cron matches clock minutes, not elapsed time.

How do you run a cron job every minute only on specific h… - Cron answer & example

Q: How do you run a cron job every minute only on specific hours?

Use * 11,16,21 * * *: minute * with an hour list runs every minute during those three hours, 180 times a day. For one run per hour change the minute to 0.

Question

How do you run a cron job every minute only on specific hours?

Answer

Use an asterisk in the minute field and list the hours when the job may run. The expression below fires once per minute throughout the 11th, 16th, and 21st hours: from 11:00 through 11:59, 16:00 through 16:59, and 21:00 through 21:59. That produces 180 runs per day.

crontab

# every minute during hours 11, 16, and 21
* 11,16,21 * * *

Read * 11,16,21 * * * from left to right: the minute * matches every minute; 11,16,21 selects those three hours in 24-hour time; the day-of-month * allows every date; the month * allows every month; and the day-of-week * allows every day of the week. If you intended one run at the top of each selected hour, change the minute field to 0. For a lower frequency within each selected hour, use a minute step such as */5 or */15, after confirming that your cron implementation supports step syntax.

Run * 11,16,21 * * * on Crontap

Why this matters

An asterisk in the minute field can turn what looks like three selected times into 180 daily executions. That can create overlapping jobs, duplicate writes, unexpected API traffic, or a sharp load spike if each run takes longer than one minute. Confirm that jobs cannot overlap, or add locking or idempotency where needed. If your intent is only three daily runs, use 0 11,16,21 * * * instead.

Read the dedicated guide: Cron business hours.

Cron schedule used

What it does

* 11,16,21 * * * — command

Every minute, at 11:00, 16:00, and 21:00, every day.

Run in Crontap Cheatsheet

Calendar

View future cron matches in a calendar

September 2026 · UTC

0 runs

See this cron expression on the calendar view example

Run a cron job every minute during specific hours

What it does

Calendar

Point Crontap at any URL. Pick any cron. Done.

What it does

Calendar

Related questions

How do you run a cron job every minute only on specific hours?

How do I set up a cron job that runs every day at 1PM, 2PM and 3PM?

How can I run command every six hours every day?

I am trying to add a crontab entry to execute a script every 30 minutes, on the hour and 30 minutes past the hour or something similar. How can I do this?

Related cron questions

How do I set up a cron job that runs every day at 1PM, 2PM and 3PM?

How can I run command every six hours every day?

I am trying to add a crontab entry to execute a script every 30 minutes, on the hour and 30 minutes past the hour or something similar. How can I do this?

Point Crontap at any URL. Pick any cron. Done.