When does it run?
Give a cron expression or an RRULE and a time zone, and see the rule in words and its next runs, through the nights the clocks change. Time::Keeper::Recurrence walks the rule.
30 1 * * *
- Read as
- a cron expression, in Europe/London
- Cron
30 1 * * *- RRULE
FREQ=MINUTELY;BYMINUTE=30;BYHOUR=1
| Run | Clock | From now |
|---|---|---|
| Friday, 23 October 2026, 01:30 | BST |
in 7 hours |
| Saturday, 24 October 2026, 01:30 | BST |
in 2 days |
| Sunday, 25 October 2026, 01:30 the first time this hour comes | BST |
in 3 days |
| Monday, 26 October 2026, 01:30 | GMT |
in 4 days |
| Tuesday, 27 October 2026, 01:30 | GMT |
in 5 days |
| Wednesday, 28 October 2026, 01:30 | GMT |
in 6 days |
| Thursday, 29 October 2026, 01:30 | GMT |
in 7 days |
| Friday, 30 October 2026, 01:30 | GMT |
in 8 days |
| Saturday, 31 October 2026, 01:30 | GMT |
in 9 days |
| Sunday, 1 November 2026, 01:30 | GMT |
in 10 days |
The clocks change
Sunday, 25 October 2026. The clocks go back an hour at 02:00, to 01:00 (GMT). The times from 01:00 to 01:59 happen twice.
A run at a set minute comes once, at the first. A rule that runs every minute runs through both.
As iCalendar
RRULE:FREQ=MINUTELY;BYMINUTE=30;BYHOUR=1
Try
0 9 * * 1-5weekdays at nine*/15 9-17 * * 1-5every 15 minutes in working hoursFREQ=MONTHLY;BYDAY=1MOthe first Monday of the monthFREQ=MONTHLY;BYMONTHDAY=-1the last day of the month30 2 * * *02:30, on a night the clocks change30 1 * * *01:30, through the hour that comes twice