ReadCron

Build, understand, and validate cron expressions — instantly.

Runs every minute
Quick presets:
Edit fields
Next 5 runs

Cron Expression Reference

A cron expression has five fields, separated by spaces. Each field controls a unit of time.

* * * * *
minute hour day of month month day of week
Field Values Special Characters
Minute 0 – 59 * / , -
Hour 0 – 23 * / , -
Day of Month 1 – 31 * / , -
Month 1 – 12 or JAN – DEC * / , -
Day of Week 0 – 6 (0 = Sunday) or SUN – SAT * / , -

Special Characters

Character Meaning Example
* Every value in the field * * * * * — every minute
/ Step — every Nth value */15 * * * * — every 15 minutes
, List of specific values 0 9,17 * * * — 9am and 5pm daily
- Range of values 0 9 * * 1-5 — 9am, Monday–Friday

Common Examples

Expression Meaning
* * * * *Every minute
*/5 * * * *Every 5 minutes
0 * * * *Every hour on the hour
0 0 * * *Every day at midnight
0 12 * * *Every day at noon
0 9 * * 1-59am every weekday (Mon–Fri)
0 0 * * 0Every Sunday at midnight
0 0 1 * *1st of every month at midnight
0 0 1 1 *Once a year — January 1st at midnight
30 6 * * 1-56:30am on weekdays