Cron Expression Parser

What it does

The cron expression parser explains a cron schedule in plain language and lists the next times it will run. Cron syntax is compact but easy to get wrong: is 0 9 * * 1-5 nine o’clock on weekdays, or every minute of nine o’clock? Paste an expression here before you deploy it and check exactly when it fires.

Each of the five fields is also broken down into the exact values it allows, which makes mistakes in ranges and steps easy to spot.

How to use

1. Type a cron expression into the input, or click Sample.
2. Read the description and the field table. Errors point at the field and column that are wrong, for example an hour of 24.
3. Choose Local time or UTC for the upcoming runs, and how many runs to show.

Cron syntax

A cron expression has five fields separated by spaces:

┌───────────── minute (0–59)
│ ┌─────────── hour (0–23)
│ │ ┌───────── day of month (1–31)
│ │ │ ┌─────── month (1–12 or JAN–DEC)
│ │ │ │ ┌───── day of week (0–7 or SUN–SAT, 0 and 7 are Sunday)
│ │ │ │ │
* * * * *

Symbol	Meaning	Example
*	every value	* in the hour field = every hour
,	a list	1,15 = on the 1st and 15th
-	a range	MON-FRI = Monday to Friday
/	a step	*/15 = every 15 minutes

Shortcuts are also accepted: @hourly, @daily (or @midnight), @weekly, @monthly and @yearly (or @annually).

Examples

Expression	Runs
*/5 * * * *	every 5 minutes
0 * * * *	at the start of every hour
0 9 * * 1-5	at 09:00 on weekdays
30 2 1 * *	at 02:30 on the first day of each month
0 0 * * 0	at midnight every Sunday