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  1. Jenkins
  2. JENKINS-22106

@midnight is vulnerable to DST witching hours


    • Icon: Bug Bug
    • Resolution: Won't Fix
    • Icon: Minor Minor
    • core

      For servers using local time in regions with daylight saving time, twice a year there are "witching hours" for cron-like scheduling: a task scheduled for between 2:00 (AM, inclusive) and 3:00 (exclusive) will skip a day in the spring, and run twice on a single day in the fall. Unfortunately the @midnight macro in Jenkins is defined as H H(0-2) * * *, which for ⅓ of jobs will trigger the DST problem.

      Perhaps it should be redefined as H H(0-1) * * * to avoid this? During upgrade this would cause a one-time occasion when some jobs run 23 hours after the last run, which is not great but probably not a big deal. And it compresses the "midnight" range unnecessarily for servers using (say) UTC.

            Unassigned Unassigned
            jglick Jesse Glick
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