Time zone converter
Convert a time between cities and time zones, with daylight saving.
About this calculator
This time zone converter shows what time it will be in another city or time zone. Pick a date and time, where you are and where they are.
Daylight saving time is handled for each place, so it's reliable for planning calls, meetings and flights.
How it works
Uses your browser’s built-in copy of the IANA time zone database, which includes the daylight saving rules for each place, to turn the time into UTC and then into the other zone.
Last reviewed:
Common questions
What is UTC?
Coordinated Universal Time, the world's reference time. Time zones are described as offsets from it, such as UTC−05:00 for New York in winter.
Why does the time difference change during the year?
Countries start and end daylight saving on different dates, and some don't use it at all, so the gap between two cities can shift by an hour for a few weeks.
Is GMT the same as UTC?
For everyday use, yes. GMT is a time zone used in the UK in winter, while UTC is the scientific standard. They show the same time.
Sources and further reading
The story behind it
Where the idea came from: In 1884 the International Meridian Conference chose Greenwich as the prime meridian, the starting point for the world's time zones.
Before railways, every town kept its own local time set by the sun. Trains needed timetables that made sense, so railways in Britain, then North America, adopted standard time zones. Today the IANA database tracks the time rules of every region.
Why you can trust this calculator
- It runs in your browser. Nothing you type into it is sent anywhere.
- The method is explained on this page, so you can check it yourself.
- Free to use, with no sign-up.
- Results are estimates, so please double-check anything important.
- Spotted a mistake? Tell us and we'll look into it.
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