Time & Date
Cron Expression Calculator
Build, parse and validate cron expressions with human-readable descriptions and next run times
Formulas and edge cases are reviewed against authoritative references before publication. For methodology, editorial standards, or corrections, use the links below.
Frequently asked questions
What does * mean?
Asterisk means 'every' - so * in minute field means every minute.
What is */5?
Step value - */5 in minute field means every 5 minutes (0, 5, 10, 15...).
What is L in day field?
L means 'last' - L in day-of-month means last day of the month.
Related tools
About this tool
This Cron Expression Calculator turns your inputs into practical results. Provide Minute, Hour, and Day of Month to calculate Expression and Description.
Adjust values to compare scenarios and see how sensitive the result is. The calculation uses the numbers as entered, so double-check units and expect small differences from rounding in the displayed totals.