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Avoid Date, Time Zone and Daylight Saving Bugs in Software

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Self-Hosting & Infra intermediate 7 min read $0.01 Updated 2026-10-19

Rules for correct date and time handling: store UTC timestamps, keep user time zone as an IANA name, avoid fixed offsets, DST gaps and ambiguous times, date-only vs instant types, ISO 8601, parsing pitfalls, scheduling recurring events and testing with fixed clocks.

Dates shift by a day, schedules fire an hour off twice a year, and servers disagree. Store UTC instants, keep IANA zone names, use calendar libraries, and handle DST gaps and overlaps explicitly.

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