Time zone converter
Date & timeWhat time is it there when it's this time here?
One time converted to several time zones at once, with the date, the offset and daylight saving time on that day.
Time and place
What you enter stays on your device while you use this tool. Opening a shared link sends the settings in its address to HowToolbox to prepare the page.
For example 14:30 or 1430. Leave empty for now.
Date and places
Leave empty for today.
- UTC
- London
- New York
- Tokyo
Time there
––:––
Time in each place
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One time converted to several time zones at once, with the date, the offset and daylight saving time on that day.
How to use
- Type the time on the 24-hour clock, or leave it empty to use the time now.
- Pick the time zone that time is in; this device's zone is chosen first.
- Add the places you want to see, and the date if it is not today.
- Read the time in every place; the table shows each offset and how many hours ahead or behind it is.
Local times at 12:00 UTC on 15 January 2026
How it works
Every place keeps its clock a set amount ahead of or behind Coordinated Universal Time (UTC), the world's reference time. That amount is the offset: Helsinki is UTC+2 in winter, New York UTC−5, India UTC+5:30. To convert, the time is first turned into UTC and then into each other place's local time.
The rule is local time = UTC + offset. For example, 14:30 in Helsinki on 1 July is 11:30 UTC, because Finnish summer time is UTC+3; New York is UTC−4 in summer, so it is 07:30 there, 7 hours behind. Offsets change when a place starts or ends daylight saving time, and the dates differ between countries: in late March the gap between Finland and New York is 6 hours for about three weeks.
The offsets come from the IANA time zone database, the public record of every region's clock rules, as it is built into your browser. When clocks go back, one hour happens twice and the first one is used; when clocks go forward, one hour does not exist and the time is read with the offset before the change. Future rules can change if a government changes them.
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Frequently asked questions
Why is the difference between two places not the same all year?
Because they change their clocks for summer on different dates, or only one of them does. Europe and North America switch a few weeks apart, and countries south of the equator have summer in January.
What does UTC+5:30 mean?
The local time is 5 hours and 30 minutes ahead of UTC. A few places use half or even quarter hours, such as India (+5:30) and Nepal (+5:45).
Is UTC the same as GMT?
For everyday use, yes. UK time is GMT only in winter; in summer the UK uses British Summer Time, UTC+1.
Why can a converted time be on a different date?
When it is evening in America it is already the next morning in Asia and Australia. The result says when the date changes.
Can I convert a future date?
Yes. Enter the date as well as the time; the conversion uses the time-zone rules available for that date.
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