What is a cron expression?

A cron expression is a string of five fields (minute, hour, day, month, weekday) that defines a schedule for running automated tasks.

What format does this tool use?

This tool uses the numeric 5-field Cronie format: minute (0-59), hour (0-23), day of month (1-31), month (1-12), and day of week (0-7, where 0 and 7 are Sunday). Month/day names and tilde randomization are not supported.

Developer Utilities

Cron Expression Parser

Parse cron expressions and explain their schedules.

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How to Use Cron Expression Parser

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Frequently Asked Questions

What is a cron expression?: A cron expression is a string of five fields (minute, hour, day, month, weekday) that defines a schedule for running automated tasks.
What format does this tool use?: This tool uses the numeric 5-field Cronie format: minute (0-59), hour (0-23), day of month (1-31), month (1-12), and day of week (0-7, where 0 and 7 are Sunday). Month/day names and tilde randomization are not supported.

Sources & references

Primary references: Linux manual: crontab(5).

Last reviewed: 2026-07-13