Does this use my browser's local time zone or UTC?
Your browser's local time zone. Both the "next run times" preview and any time-of-day fields you enter are computed against your device's local clock, not UTC or a server time zone.
Developer Tools
Cron Expression Generator & Parser
Build a cron expression with a simple form, or paste one to get a human-readable description and the next 5 run times. Everything runs locally in your browser.
Cron Generator
Cron Parser
FAQ
Cron Generator FAQ
Does this tool support cron expressions with seconds?
No. It supports the standard 5-field Unix cron format — minute, hour, day-of-month, month, day-of-week. Six-field "seconds" variants used by some schedulers (like Quartz) aren't supported.
Is my cron expression sent to a server?
No. Parsing, building, and computing next run times all happen in your browser with JavaScript.