WhatTheCron

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Ever looked at a cron job and thought… what the cron?

Instantly decode, explain, and preview your cron schedules.

Enter a cron expression

Cron Cheatsheet

Cron format: minute hour day month weekday

Some systems (Quartz, Spring, etc.) support 6 fields with seconds at the start

Fields ranges:

  • Seconds: 0–59 (if supported)
  • Minutes: 0–59
  • Hours: 0–23
  • Day of Month: 1–31
  • Month: 1–12 (or JAN–DEC)
  • Day of Week: 0–7 (0 and 7 = Sunday, or SUN–SAT)

Use * to match any value in that field

Sunday can be represented as either 0 or 7