How to Think About Time in Programming
Time handling in programming involves understanding absolute time (precise instants) versus civil time (human-readable formats). UTC provides global time synchronization with leap seconds, while timezones convert between UTC and local time using rules that can change unpredictably. The IANA timezone database tracks historical and current timezone rules globally. Common advice like "just use UTC" can cause bugs when handling user-facing datetime interactions or future events that depend on local civil time rather than absolute time.
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