Cron expression builder

Build a five-field cron expression and inspect upcoming dates before adding it to a scheduler. An expression selects calendar minutes rather than a fixed elapsed delay between runs. The preview is calculated in your browser using either your device’s local time or UTC. It installs no program, saves no scheduled job and runs no command. Check that your destination service uses the same dialect and time zone before relying on the schedule.

The fields are minute, hour, day of month, month and day of week, in that order. Their ranges are 0–59, 0–23, 1–31, 1–12 and 0–7. Sunday accepts 0 or 7. English abbreviations JAN to DEC and SUN to SAT are supported. An asterisk selects every value, commas combine values, a hyphen describes a range, and a slash supplies a step over a range or *.

Steps refer to positions within a field: */15 in minutes selects 0, 15, 30 and 45 even when you request the preview at 09:07. When both day fields are restricted, the tool uses their union, following traditional cron. Therefore 0 9 1 * MON means the first of every month and Mondays, rather than only months whose first day is Monday.

Searching starts at the next minute and covers approximately five years at most. An impossible combination such as 31 February with no other matching day produces no occurrence. The interface shows up to five results. Local daylight saving changes may skip or repeat an hour; this preview does not promise the same catch-up policy as your scheduler. Seconds, years, @daily macros and Quartz extensions ?, L, W and # are unsupported.