π Time Zone Converter
Pick a date and time, choose the two zones, and get the other side's clock β daylight saving is handled automatically from the IANA time zone database.
π°οΈ The same moment around the world
| City | Local time | Day vs. from-zone |
|---|
Offsets shown are the actual offsets on the chosen date, not the January or July average β which is why a US-to-Europe call can be four hours apart in March and five hours apart in April.
How to use this converter
Enter the local date and time on the "from" side, pick both zones, and read the result. Swap the two zones to convert in the other direction. Use the time-format selector to switch between a US 12-hour clock and a 24-hour clock; the underlying value never changes, only its presentation.
How the conversion works
Every zone in the list is an IANA identifier such as America/New_York or Asia/Tokyo. The browser's internationalisation API knows the offset each identifier applies on a given date, including daylight saving transitions and their historical changes. The page converts your wall-clock time to UTC using the source zone's offset, then renders that instant in the target zone. Because the offset itself depends on the date, the conversion is resolved twice β that catches the one-hour transition days where a naive single subtraction lands on the wrong side.
What the difference figure means
"Difference" is target minus source on that date: +8 hours means the target clock is eight hours ahead. It is not a fixed property of the pair of cities β zones that observe daylight saving shift on different dates, so New York and London are five hours apart for a few weeks each spring and autumn while they are four hours apart the rest of the year.
Assumptions and limitations
Time zone rules come from the browser, so an old browser or operating system can be missing a recent change β a country that abolished or introduced daylight saving within the last update cycle may convert incorrectly. Times that do not exist (the hour skipped when clocks spring forward) are resolved forward to the next valid instant, and times that occur twice in autumn resolve to the first occurrence. Nothing here accounts for calendar systems other than the Gregorian calendar.
Frequently Asked Questions
Does this handle daylight saving time automatically?
Yes. You do not tell it whether daylight saving is in effect β you give a date, and the browser looks up the offset that applies on that date for the chosen IANA zone. That is also why picking the wrong date gives the wrong answer by an hour: 9:00 AM on 1 March and 9:00 AM on 1 April can be different offsets in the same city.
Why is New York sometimes 4 hours behind London and sometimes 5?
Because the two regions switch on different dates. The US moves to daylight saving on the second Sunday in March and back on the first Sunday in November; the EU switches on the last Sunday in March and back on the last Sunday in October. In the gaps β roughly three weeks in spring and one week in autumn β the offset between them is five hours instead of the usual four.
Is UTC the same as GMT?
For everyday purposes yes: both are zero offset, with no daylight saving. Strictly, GMT is a time zone name and UTC is the atomic time standard that civil time is referenced to; they agree to within a second. If a meeting invitation says "14:00 UTC", treat it as "14:00 London in winter" and convert from there.
What is the best time for a call across two zones?
Look at the note under the result: it reports the overlap between 9:00β17:00 in both places. If the overlap is zero, no business hour works for both, and the usual compromise is early morning for one side and late afternoon for the other. Scheduling the call in UTC and letting each calendar client convert it avoids the mistake of converting twice.
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