Cron Expression Explainer
This explainer turns common five-field cron syntax into a visible field-by-field summary so you can catch obvious mistakes before adding a scheduled job.
Read a five-field cron expression in plain language
Enter minute, hour, day-of-month, month, and day-of-week fields separated by spaces.
Processing mode: browser-only for this tool. The interface does not require a server upload to perform its transformation.
Start with a focused browser tool
This explainer turns common five-field cron syntax into a visible field-by-field summary so you can catch obvious mistakes before adding a scheduled job.
Designed for: Developers and operators checking common Unix-style scheduled-task expressions.
How to use this tool
Enter five fields such as 0 9 * * 1-5. The tool labels each field and explains wildcards, lists, ranges, and step values. Treat the output as a review aid and confirm the target scheduler’s dialect.
How the result is produced
The browser tokenizes the five fields and describes the punctuation patterns it recognizes. It does not execute a scheduler or calculate every future run time.
Test examples
0 9 * * 1-5 is summarized as minute 0, hour 9, every day of month, every month, weekdays 1 through 5. */15 * * * * is summarized as every 15 minutes in the minute field.
Limitations
Cron dialects differ. This page does not fully model Quartz, systemd timers, cloud schedulers, seconds fields, special macros, time zones, daylight-saving transitions, or platform-specific day-of-month/day-of-week rules.
Privacy and processing
The expression is interpreted locally in the browser and is not uploaded.
Related guide
Five-field cron syntax: the checks to make before scheduling
Related tools in this category
Documentation
This page describes the implementation shipped with the NOFYI Tool Factory. Review the interface output before using it in a production workflow.