Which cron dialect is supported?

The tool supports classic five-field Unix cron: minute, hour, day of month, month and day of week. Quartz seconds, years and vendor-specific extensions are excluded.

Can Sunday be written as both 0 and 7?

Yes. The traditional numeric forms 0 and 7 are accepted, along with common SUN–SAT and JAN–DEC aliases.

Why is there a warning about the two day fields?

Traditional Unix cron uses OR when both fields are restricted. A run can occur when either the day of month or day of week matches.

Does changing Local to UTC modify the expression?

No. A five-field expression carries no timezone. The choice changes only local calculation and display of upcoming runs.

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Cron Expression Generator & Parser

Construct classic Unix cron schedules, understand every field and preview upcoming executions in local time or UTC.

Cron Expression

Quick Presets

Build Schedule

MinuteHourDay of MonthMonthDay of Week

Enter a cron expression or choose a preset to view the schedule.

Cron Syntax Reference

*: Any value
*/15: Every 15 units
1,15,30: Specific values
9-17: Range
1-5: Range of numeric values or weekdays
MON-FRI: Monday through Friday

Minute | Hour | Day of Month | Month | Day of Week

Minute: 0–59
Hour: 0–23
Day of Month: 1–31
Month: 1–12 / JAN–DEC
Day of Week: 0–7 / SUN–SAT

Your cron expression is processed locally in your browser.

How to use Cron Expression Generator & Parser

1
Enter a five-field Unix cron expression, choose a preset or edit the synchronized Build Schedule fields.
2
Use wildcards, lists, ranges, steps or supported month and weekday names.
3
Read the Schedule Description and inspect the interpretation of all five fields.
4
Check the day-field warning when both Day of Month and Day of Week are restricted.
5
Select Local or UTC for the next ten runs, then copy the expression when ready.

Frequently asked questions

About Cron Expression Generator & Parser

Cron expressions are compact enough to hide mistakes. The builder and parser share one five-field model, so direct edits, presets and individual field controls remain synchronized. Each field receives a literal breakdown alongside a concise schedule description, exposing ranges, lists and steps before deployment.

The next-run preview interprets the schedule through either the browser's local timezone or UTC. It also preserves the classic OR rule between restricted day fields and calls attention to it rather than simplifying the schedule incorrectly. This tool calculates times only; it does not create jobs or run commands.