Avoid Scheduling Cron Jobs at 2-3 AM Due to Daylight Saving Time Issues
By
pera
Crispy enough to crunch, soft enough to enjoy. A good bake.
Summary
The article warns against scheduling cron jobs (automated tasks) for 2:00 am or 3:00 am on Sunday mornings due to daylight saving time transitions. It explains that while such jobs usually run fine, twice per year when daylight saving time begins or ends, these jobs can experience strange behavior, potentially running multiple times per second or not at all. The advice extends to avoiding these times on other days as well, since cron job schedules might be changed later.
Key quotes
· 3 pulledA word to the wise: Do not set any cron jobs for 2:00 am or 3:00 am on Sunday morning!
Most of the time such cron jobs will run fine, but if they run every Sunday morning, then twice per year they will run at the exact time daylight savings time (aka summer time) kicks in or ends, sometimes with very strange results.
Or to be safe, on other mornings besides Sunday as well, since jobs originally set to run on some particular day may eventually be changed to run on another day, or every day.
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