Cron and DST
2024-10-27 (Sunday)
These experiments were done with Vixie Cron on Ubuntu. Other cron implementations may behave differently. At least for daily and hourly jobs it behaves sensibly. Cron job which should run daily (in the DST window) 2024-03-30T02:30:01+0100 2024-03-31T03:00:01+0200 2024-04-01T02:30:01+0200 In spring, since 02:30 doesn’t exist, the job runs at the earliest time after that, so at 03:00+0200. 2024-10-26T02:30:01+0200 2024-10-27T02:30:01+0200 In fall, the job runs once, during the first time it’s 02:30.