Time Zone Converter
What time is it there? Any city, with daylight saving handled.
Converting a time between zones
Pick a date and time, and every zone in the list shows what the clock reads there at that same moment. The first row is the reference — the zone the time above is entered in — and any other row can be promoted to it with the ★ button. Add cities by name (Tokyo), by country (Japan), by the abbreviation people put in emails (EST, CET, IST) or by the IANA name software uses (Asia/Tokyo).
Under each zone is a strip of 24 hours lined up against the reference day. Working hours are highlighted and night hours dimmed, so finding a meeting time that suits everybody is a matter of looking for the column where every row is lit. Click any hour to jump to it.
Daylight saving time is handled for you
Offsets are not fixed. New York is UTC−5 in winter and UTC−4 in summer; Sydney moves the other way, because its summer is in January; most of Asia does not change at all. And countries start and stop daylight saving on different dates, so for a few weeks every spring and autumn the gap between London and New York is four hours instead of five. This converter does not keep its own table of offsets — it asks your browser, which ships the IANA time zone database used by every major operating system, and so applies the rules in force on the exact date you picked.
Two moments a year need special care, and the converter tells you when you have hit one:
- Times that do not exist. When clocks spring forward, the hour from 2:00 to 3:00 is skipped. Ask for 2:30 that night and you get 3:30 — what a phone calendar would do — with a note explaining why.
- Times that happen twice. When clocks fall back, 1:00 to 2:00 is repeated. The converter uses the first occurrence and tells you the second exists an hour later.
Abbreviations are ambiguous — names are not
IST means India Standard Time to most people, but it is also Irish Standard Time and Israel Standard Time. CST is US Central, China Standard and Cuba Standard. When you search by abbreviation the converter picks the most common meaning and shows the full zone name beside it, so you can see exactly which one you got. If a meeting invitation matters, write the city — "9:00 New York time" — rather than "9:00 EST", which is also wrong for half the year: in summer New York is on EDT.
Frequently asked questions
What is the difference between UTC and GMT?
For converting clock times, none: both are offset zero. UTC is the atomic time standard that civil time is defined from; GMT is the time zone used by the UK in winter. The UK switches to BST (UTC+1) in summer, so "London time" and "GMT" are only the same between late October and late March.
Why do some zones have half-hour or 45-minute offsets?
Because countries set their own. India is UTC+5:30, Newfoundland UTC−3:30, Nepal UTC+5:45 and the Chatham Islands UTC+12:45. They are all real, and all handled.
Why does a row say +1 day or −1 day?
Because at that moment the date there is different from the reference. Tokyo is already tomorrow when it is evening in New York. Across the International Date Line the gap can exceed a full day: Kiribati (UTC+14) and American Samoa (UTC−11) are 25 hours apart, so their clocks can read the same hour on different dates.
Can I share a conversion?
Yes. The address bar always holds the zones and the time you picked, so "Copy link" gives you a URL that opens this exact comparison for whoever you send it to. Your list of zones is also remembered in this browser for next time.
Is anything sent to a server?
No. Every calculation uses the time zone data built into your browser. There is no lookup, no account and no tracking of what you convert.