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Cron expression builder

Build a five-field UTC cron expression with presets and an interactive map of matching values.

Cron field map
Minute4 matching values
01234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859

Select a field to inspect its expanded values. Day of week:0 or7 is Sunday. All times use UTC.

0–59
0–23
1–31
1–12
0–7

The expression contains the five fields only. Times use UTC.

Processed on your device

How it works & useful details

How it works & supported syntax

Numeric five-field Unix-style cron, interpreted in UTC. Supports *, comma lists, ascending ranges and steps on * or ranges. Names, seconds, years, macros, ?, L, W and # extensions are unsupported.

If both day fields are restricted, either may match. If either starts with *, both must match. A cron expression describes a schedule; this tool does not schedule or run a command.

Local workspace

Your input stays in this page. These tools calculate or process text; they do not run commands, start containers, contact servers or change settings on your device.

Previews pause above 20,000 combined characters. Use the action to process the full supported input. Exports contain the complete result within the tool’s stated limits.