Why Time Zone Conversion Is Tricky and How Intl.DateTimeFormat Helps

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A free browser-based time zone converter lets users enter a date and time in any of 40 IANA zones and see it across up to eight others, with UTC offsets and daylight-saving abbreviations. It relies on the browser's built-in Intl.DateTimeFormat, which draws on the IANA database so developers need not maintain their own offset tables. The article explains edge cases such as half-hour and 45-minute offsets, the daylight-saving gap and fold, and Arizona's year-round UTC-7 setting. It recommends using IANA zone names rather than fixed offsets so calculations stay correct across seasons.

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