Free Online Calculators
Convert date & time between any time zones worldwide
This timezone converter instantly translates any date and time from one time zone to another, anywhere in the world. It automatically accounts for UTC offsets and daylight saving time so you always get the accurate local time. Perfect for scheduling international meetings, planning trips, or coordinating across continents.
Planning a video call with a colleague in Singapore, booking a flight that crosses multiple time zones, or simply trying to figure out whether your favorite sports team's game has already started in another country? Our Timezone Converter removes all the guesswork. Enter any date and time, select two IANA time zones, and get the converted result instantly — complete with the exact hour difference between the two locations.
Time zones are not just about adding or subtracting a fixed number of hours. Many regions observe Daylight Saving Time (DST), which shifts the offset seasonally. Our calculator uses the browser's built-in Intl API, backed by the IANA timezone database, so every DST rule is handled automatically — no plugins, no external libraries required.
Under the hood, the converter follows a straightforward three-step process:
The displayed time difference is derived from the difference between the two UTC offsets at the chosen moment. This matters because countries often change their clocks on different dates, creating a temporary shift in the usual difference.
A product team in New York (America/New_York) wants to hold a meeting at 9:00 AM EST on January 20, 2025. What time is that for colleagues in London? In January, London is on GMT (UTC+0), while New York is on EST (UTC−5). The difference is 5 hours, making it 2:00 PM GMT in London — a perfectly reasonable afternoon slot.
A major esports tournament final kicks off in Tokyo (Asia/Tokyo, UTC+9) on March 10, 2025 at 8:00 PM JST. A fan in Los Angeles wants to know when to tune in. LA is on PST (UTC−8) in March, giving a difference of 17 hours. The local start time in LA is 3:00 AM PST on March 10 — dedication required!
A flight departs Dubai (Asia/Dubai, UTC+4) on June 5 at 11:00 PM and lands in London (Europe/London, BST UTC+1) after 7 hours. The landing time in Dubai terms is June 6 at 6:00 AM (UTC+4), which equals 3:00 AM BST in London. The converter handles the date rollover automatically.
Yes. Because the tool relies on the IANA timezone database via the browser's Intl API, all DST transitions are included automatically. Simply enter the correct date and the calculator applies the right offset — whether it's summer or winter time.
A raw UTC offset like UTC+2 tells you nothing about DST rules. The IANA name Europe/Paris, for instance, knows that France moves to UTC+2 in summer and UTC+1 in winter. Using IANA identifiers ensures accurate results year-round, not just for a fixed offset that may be wrong half the year.
Yes, the converter works for any date you enter. Historical conversions are highly accurate because past DST rules are well-documented in the IANA database. For future dates, results are reliable for the foreseeable future, though governments occasionally change DST rules with little notice, which could affect far-future calculations.