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Cron Expression Parser & Explainer
Decode any cron schedule into plain English.
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About Cron Expression Parser & Explainer
Paste a 5-field cron expression to see every field explained and the next run times.
How to read a cron expression
Standard cron has five fields in order: minute (0-59), hour (0-23), day of month (1-31), month (1-12), and day of week (0-7, where both 0 and 7 mean Sunday). An asterisk means every value, a slash sets steps such as every 15 minutes, commas list values, and hyphens define ranges. So 0 9 * * 1 means 9 AM every Monday.
Special strings and Quartz differences
Many schedulers accept shortcuts like @daily, @hourly, @weekly, and @reboot as friendlier aliases. Note that Quartz (Java) and some cloud schedulers use six or seven fields with seconds first, so a 5-field expression pasted into Quartz needs a leading seconds value added.
📐 Methodology & Reference Accuracy:
Calculations, formulas, and conversions execute locally in your web browser. Output models are benchmarked against official reference standards and updated for 2026.
🔒 This tool runs entirely in your browser. Nothing is uploaded or stored.
Background reading: Cron Parser on Wikipedia. More: all developer tools.
Frequently Asked Questions about Cron Expression Parser & Explainer
What does 0 0 * * * mean?
Midnight every day: minute 0, hour 0, with day, month, and weekday unrestricted.
How do I run something every 15 minutes?
Use a step value in the minute field. The exact form depends on your scheduler, commonly written as a slash-15 step, which this parser explains field by field.
Why did my cron job not run?
The usual causes are a wrong field order, a timezone mismatch between the schedule and the server, the cron daemon not running, or an environment difference such as a missing PATH for scripts.
Is day-of-month OR day-of-week?
In standard Vixie cron, when both fields are restricted (not asterisks), the job runs when either matches. To require a specific date regardless of weekday, keep the weekday field as an asterisk.
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