Time & Data
Cron Explainer
Explain simple cron expressions and preview upcoming runs.
Supports common five-field cron expressions: minute hour day month weekday.
About Cron Explainer
Cron Explainer translates five-field cron expressions into plain language and previews upcoming run times.
Common uses
- Explain a scheduled job before changing it.
- Check whether a weekday or day-of-month field is restrictive.
- Preview the next runs for a simple maintenance task.
Good to know
Cron dialects vary. This explainer focuses on common five-field cron expressions and may not cover provider-specific extensions.
How to read cron
Read the five fields from minute to weekday, then preview upcoming runs. A schedule can look simple but behave unexpectedly when both day-of-month and weekday fields are restricted.
Provider differences
This tool focuses on common five-field cron expressions. Hosting platforms, CI services, and cloud schedulers may add seconds, years, macros, or timezone settings.
Common mistakes
Cron expressions usually do not include a timezone in the expression itself. Check the scheduler's configured timezone before relying on a preview.
Before you rely on the output
- Confirm timezone, unit, precision, and source-system expectations before using converted values for scheduling, billing, legal, or operational deadlines.
- Privacy mode: inputs are processed locally in your browser and are not intentionally sent to an application server.
Related tools
Byte Size Converter, Cron Builder, Number Base Converter, Timezone Converter