Time Zone Converter
The Time Zone Converter converts any date and time from one time zone to another, automatically accounting for daylight saving time using your browser's built-in time zone database.
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How This Tool Works
Choose a date and time, select the source time zone, and select the target time zone to see the converted local time instantly.
Formula & Method
We use the Intl.DateTimeFormat API with the IANA time zone database (built into your browser) to correctly resolve UTC offsets, including daylight saving time transitions, for any date.
Example Calculation
3:00 PM in New York (Eastern Time) converts to 8:00 PM in London during standard time, or 8:00 PM during British Summer Time depending on the date.
Frequently Asked Questions
Does this account for daylight saving time?+
Yes — conversions use your browser's built-in IANA time zone database, which automatically applies the correct daylight saving rules for any given date.
Why do some conversions cross into the next or previous day?+
Large time zone differences can push the converted time past midnight, so the result may land on the day before or after your original date — the calculator labels this clearly.
Can I convert between any two cities?+
Yes, choose any two zones from the list to convert between them — the list covers major time zones representing most regions of the world.
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