15 * * * * — what this cron expression means
The cron expression 15 * * * * runs at 15 minutes past every hour. Here is the field-by-field breakdown and what it means in plain English.
What 15 * * * * means
It runs at 15 minutes past every hour.
Field by field
minute=15, hour=* (every hour), rest *.
A fixed minute with a wildcard hour means once an hour, at :15 — 24 runs a day.
When it runs next
Next run: the coming :15 (e.g. 14:15, then 15:15).
FAQ
What does 15 * * * * mean?
It runs once an hour, at 15 minutes past the hour, every day.
How is 15 * * * * different from */15 * * * *?
15 * * * * runs once an hour (only at :15). */15 * * * * runs four times an hour (:00, :15, :30, :45).