Time Zone Converter
What time it is in another city, on any date, with daylight saving time included.
Good to know. For three weeks each spring, New York is 4 hours behind London instead of 5. Clocks change on different days.
How it works
In plain words
The time you enter is turned into a single moment using the first city’s offset from UTC on that date, including daylight saving time. That moment is then shown in the second city’s local time, using its own offset on that date.
The formula
UTC = local time − offset(from, date) time there = UTC + offset(to, date)
Worked example
09:00 in New York on 15 March 2026 is 13:00 in London. New York is already on daylight saving time (UTC−4) but London isn’t yet (UTC), so the gap is 4 hours, not the usual 5.
Sources
- IANA Time Zone Database The time zone and daylight saving rules built into browsers and phones.
Sources checked September 30, 2026. 7 automated tests check its answers on every change.
About the time zone converter
Planning a call with someone abroad, catching a flight or watching a match live all start with the same question: what time is it there? Pick a date, a time and two cities, and the converter shows the local time on the other side, with the date if it changes.
Daylight saving time is where time differences go wrong. The US moves its clocks forward on the second Sunday in March, Europe on the last Sunday in March, so for two or three weeks every spring the gap between New York and London is 4 hours instead of 5. It happens again in the autumn. Australia and New Zealand change their clocks in the opposite season, and most of Asia, Africa and South America don’t change them at all.
Because the converter works on the date you choose, it always uses the rules that apply on that day, from the time zone database built into your browser. The same database runs phones and computers, so it is updated when countries change their rules.
Some zones are not a whole number of hours from UTC: India is UTC+5:30, Nepal UTC+5:45 and Newfoundland UTC−3:30. They are all in the list. For times that fall in the hour skipped when clocks spring forward, the converter uses the moment one hour later, which is what your phone would do.
Questions people ask
What is the time difference between New York and London?
Usually 5 hours: London is ahead. For a few weeks in March and late October to early November it is 4 hours, because the two change their clocks on different dates.
Does the converter handle daylight saving time?
Yes, for the date you pick, using the time zone rules built into your browser.
What is UTC?
Coordinated Universal Time, the world’s reference time. Time zones are written as offsets from it, like UTC−5 for New York in winter.