Cron Expression Generator & Parser
Start from a preset or type your own cron expression, and read back what it actually means and when it next runs. Covers standard five-field cron and the common extensions.
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Questions people ask about this tool
What does this cron expression mean?
Paste it and you get a plain-language description ("15 3 * * 1-5" reads as "at 03:15, Monday through Friday") plus the next few run times, so you can sanity-check a schedule before you deploy it.
How do I write a cron job that runs every 15 minutes?
Use */15 * * * *. The five fields are minute, hour, day of month, month and day of week; */15 in the minute field means every 15th minute starting at zero.
Why did my cron job run on the wrong day?
Day-of-month and day-of-week are OR-ed, not AND-ed: if both are set to something other than *, the job runs whenever either one matches. Leave one as * unless you really want both.
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