How cron expressions work

A standard cron expression has five fields: minute, hour, day of month, month, day of week. Each field accepts exact values (5), lists (1,15), ranges (1-5), steps (*/10) and names (MON, JAN). For example 0 9 * * 1-5 means “at 09:00 on Monday through Friday”. When both day-of-month and day-of-week are restricted, classic cron runs the job if either matches — this tool follows that rule.

Everything runs in your browser — nothing is sent to a server. Run times are computed in your local timezone. Related tools: Unix Timestamp Converter and the JSON Formatter & Validator.