Cron Parser

How Cron Parser works

Turn a five-field cron expression into a readable description with the next five scheduled runs in your timezone. Everything happens inside this page: the tool reads your input, runs the calculation or conversion locally, and hands the result back to you. Nothing is transmitted, because there is no backend to transmit it to.

That design choice is deliberate. Most free tool sites upload your files to a server, process them there, and quietly keep a copy. Toolcin cannot do that — the site is a set of static files. If your connection dropped the moment the page finished loading, every tool would still work.

Five fields, left to right

A cron expression has five fields: minute, hour, day of month, month, day of week. The parser turns an expression into plain English so you can check it before a job runs at the wrong time — which is the classic outcome of a misplaced asterisk.

*/5 in the minute field means every five minutes; 0 3 * * * means 03:00 every day.

The day-of-month trap

When both day-of-month and day-of-week are restricted, classic cron runs the job when either matches, not both. 0 0 1 * 1 runs on the first of the month and on every Monday — usually not what the author meant.

Scheduling “last day of month” is not expressible in five fields at all; it needs 28–31 with a guard inside the script.

Time zones

Cron uses the server's local time unless a timezone is configured. A job set for 02:00 during a daylight-saving change can run twice or not at all — schedule outside the 01:00–03:00 window to avoid it.

Good to know

• Works offline once loaded, including on flights and in locked-down networks.
• No file size limit beyond your device's own memory.
• Free to use, with no account and no usage counter.
• Results are produced locally, so they are not logged or shared with anyone.

Questions