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Timezone handling requires storing timestamps in UTC while displaying them in local time. The date-fns and date-fns-tz libraries provide functions for converting between UTC and local timezones, handling daylight saving time automatically, and formatting dates correctly. Key operations include utcToZonedTime for displaying UTC timestamps locally, zonedTimeToUtc for converting user input to UTC for storage, and proper ISO string formatting to avoid parsing ambiguities. Common pitfalls include using ambiguous date strings without timezone indicators and performing naive date comparisons across timezones.

How to Handle Timezones with date-fns and date-fns-tz

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