Cron parser / examples
Cron for: every 30 minutes
*/30 * * * * At minute 0 and 30.
How it works
Fires at :00 and :30. Note that */35 would NOT mean "every 35 minutes" — steps reset at the hour boundary, giving :00 and :35 each hour. Intervals that do not divide 60 need a different scheduler.
Next runs
Variations
15,45 * * * *twice hourly, offset to :15/:45*/30 * * * 0,6half-hourly on weekends
Building something different? Paste any expression into the cron parser for a plain-English explanation and run preview.