Developer tool

Cron Expression Generator

Create a standard five-field cron schedule, validate its ranges and copy the expression.

How cron expressions work

A standard cron expression contains minute, hour, day of month, month and day of week—in that order. An asterisk means “every value”; a slash defines an interval; commas define a list; and a hyphen defines a range.

Important compatibility note

This generator uses traditional five-field syntax. Some systems add a seconds or year field, and Cloudflare Cron Triggers interpret schedules in UTC. Confirm the format and timezone required by your platform before deploying.

Examples

0 9 * * 1-5 runs at 09:00 Monday through Friday. */15 * * * * runs every 15 minutes. 0 0 1 * * runs at midnight on the first day of each month.

When to use the Cron Expression Generator

Use it when writing a crontab line or a scheduled job in CI or Kubernetes and you want to be sure the five fields mean what you think.

Examples

0 2 * * * runs every day at 02:00, a common time for backups.
*/15 9-17 * * 1-5 runs every 15 minutes during weekday office hours.

Common mistakes

Forgetting that cron uses the server's time zone, not yours.
Setting both day-of-month and day-of-week and expecting them to combine with AND; cron treats them as OR.

Created by Muhammad Irfan Aslam, Senior Systems & Cloud Engineer.