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Time Zone Converter
Convert a time across world time zones.
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How time zone conversion works
A time zone is a rule for turning a single moment (an instant in UTC) into a local wall-clock time. The converter first finds that instant: it reads your date and time as wall-clock time in the source zone and subtracts that zone's UTC offset at that moment — UTC = local time − offset. Then for each target zone it adds the target's offset: target time = UTC + offset(target).
Offsets come from your browser's built-in IANA time zone database (the same one used by operating systems), so daylight saving time changes are handled automatically — for example New York is UTC−5 in winter and UTC−4 in summer. The +1 day / −1 day label shows when the converted time falls on a different calendar date.
Why use city names like "Europe/London" instead of "GMT"?
Abbreviations are ambiguous (CST is used for China, Cuba and Central US) and don't capture DST rules. IANA names always resolve to the correct offset for any date.
Your list of zones is saved in this browser only.