Cron Parser
Cron Parser
Parse any standard or extended cron expression and explain it in plain English; list the next N scheduled trigger times; build expressions visually; compare two schedules.
Standard 5-field POSIX cron: minute hour day-of-month month day-of-week. Nicknames @yearly, @monthly, @weekly, @daily, and @hourly are supported; @reboot is not (it has no periodic schedule to show). Switch the Format toggle to AWS EventBridge for cron(0 12 * * ? *) (6 fields — adds Year, day-of-week is 1=Sun–7=Sat, and exactly one of day-of-month/day-of-week must be ? meaning "no specific value") or rate(5 minutes) / rate(1 hour) / rate(1 day) fixed-interval schedules. The RRULE Builder tab generates RFC 5545 recurrence rules (used by iCalendar/.ics files, Google/Outlook calendars) — a different, richer format than cron, supporting ordinal weekdays ("2nd Monday"), month-day lists, and explicit start/end dates.
Cron Parser
Parse any standard or extended cron expression and explain it in plain English; list the next N scheduled trigger times; build expressions visually; compare two schedules.
Common uses
- Explain "0 0 * * 1" in plain English
- Find the next 10 trigger times for a schedule
- Build a cron for every weekday at 9am
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Frequently asked questions
How do I read a cron expression?
Paste a cron expression and it is translated into plain English along with the next scheduled run times.
How do I understand what a cron expression means?
Paste it into the Parse tab for a plain-English explanation and a list of the next scheduled trigger times.
How do I build a cron expression?
The Visual Builder tab lets you pick the schedule visually and outputs the expression.
Can I compare two cron schedules?
Yes, the Comparator tab compares two schedules.
Can I generate an iCalendar RRULE?
Yes, the RRULE Builder tab creates recurrence rules.
Is my data uploaded to a server?
No. This tool runs entirely in your browser — your input is processed locally on your device and is never uploaded or stored on a server.