0 0,12 * * * — what this cron expression means
The cron expression 0 0,12 * * * runs at midnight and noon every day. Paste it into the tester below to see the next run times, or read the field-by-field breakdown.
Field-by-field breakdown
minute=0, hour=0,12 (a list: midnight and 12 PM), rest any.
The comma makes a list of values, so the job runs twice a day — 00:00 and 12:00.
When it runs
Next runs: the coming 00:00 and 12:00, alternating every 12 hours.
Edit the expression in the tester above to see how each field changes the schedule — the next run times update instantly.
FAQ
What does 0 0,12 * * * mean?
It runs twice a day: at 12:00 AM (midnight) and 12:00 PM (noon). The comma lists two hours.
Is 0 0,12 * * * the same as 0 */12 * * *?
Yes — both fire at 00:00 and 12:00. */12 is a step, 0,12 is an explicit list; the result is identical.