R.I.P.
Timezone bug in scheduler
–
“Died at 00:00 UTC. Still alive in IST.”
The grave is empty. It rose again.
Death certificate
- Status
- 🪦 Buried
- Cause of death
- TimezoneWorked perfectly, except at midnight UTC, during daylight saving, or for anyone else on Earth.
- Severity
- Medium
- Hours to kill
- 16 hours
- Killed by
- Jashanpreet
- Language
- Python
- Born
- 30 Mar 2025
- Fix merged
- 9 Apr 2025
- Buried
- 18 Apr 2025
- Component
- scheduler
- Symptoms
- Reminders fired an hour early after the clocks went forward, because times were saved without a timezone.
- The fix
- Saved reminder times in UTC along with the user's timezone.
Timeline
Every life of this bug, oldest first.
Born as “Timezone bug in scheduler”30 Mar 2025
Fix merged9 Apr 2025
Buried18 Apr 2025
Rose again as “Timezone bug in scheduler (Zombie #1)”26 Oct 2025
Risen from this grave
It came back.
The grave is empty. It rose again.