What is a cron expression?

A cron expression is a string of 5 fields (minute, hour, day-of-month, month, day-of-week) that defines when a scheduled task should run.

An asterisk (*) means 'every'. For example, * in the minute field means 'every minute'.

The slash (/) means 'every N'. For example, */5 in the minute field means 'every 5 minutes'.

How do I run a job every weekday at 9am?

Use: 0 9 * * 1-5 — that's minute 0, hour 9, any day/month, Monday through Friday.

Cron Expression Helper

Developer Tools· 30 tools

Free online cron expression helper. Build cron schedules visually or type an expression directly and get a plain-English description. Supports standard 5-field cron syntax (minute, hour, day, month, weekday). Quick presets for common schedules included.

Cron Expression (5 fields)

Minute

Hour

Day

Month

Weekday

1-5

Quick Presets

Runs

at 09:00, on Monday

Field	Range	Examples
Minute	0–59	0, */15, 30
Hour	0–23	0, 9, */6
Day of month	1–31	1, 15, L
Month	1–12	1, 6, */3
Day of week	0–6	0=Sun, 1=Mon, 1-5

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