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Developer warns against manual timezone math, advises using IANA database for DST

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A developer building a 33-city world clock detailed common pitfalls in timezone handling. They cautioned that manually applying fixed UTC offsets fails during Daylight Saving Time transitions. The article recommends using the built-in Intl.DateTimeFormat API with IANA timezone identifiers like 'America/New_York'. This approach automatically accounts for historical and current DST rules. The developer's live tool demonstrates this method across major global business hubs.

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Developer warns against manual timezone math, advises using IANA database for DST · ShortSingh