Time Zone Converter
When it is 12:00 noon on 15 July 2024 in New York (UTC-4, daylight time), it is 17:00 in London and 01:00 the next day in Tokyo. The tool handles daylight saving time automatically for any date.
How to use
- Pick the date and time, and choose the time zone it is in. It starts with your own time zone and the current time. Use Now to reset to the current time.
- The list shows the same moment in each city, with the UTC offset, whether daylight saving time is in effect, and a day marker if the date differs.
- Use Add a time zone to compare more cities, and Remove to drop one.
How it works
The tool turns your date and time in the source zone into one exact moment (UTC), then shows that moment as the local time in every other zone. Offsets come from the IANA time zone database built into your browser, so past and future daylight saving changes follow each region's rules for that date.
Time zones are named by region and city, such as America/New_York or Asia/Kolkata, rather than by abbreviations like EST or IST, because abbreviations can mean different things in different places. The UTC offset is shown next to each city, for example UTC+5:30 for India and UTC+5:45 for Nepal.
Daylight saving time makes some local times special. When clocks go forward, one hour of local time does not exist: 1:30 AM on 31 March 2024 never happened in London. When clocks go back, one hour happens twice. The tool tells you when your input falls in such an hour and uses the earlier of the two moments.
Results depend on your browser's copy of the time zone database. Countries sometimes change their rules at short notice, so for scheduling something important, confirm with the other party.
Common UTC offsets (standard time)
| Region | IANA zone | Standard offset |
|---|---|---|
| US Eastern | America/New_York | UTC-5 |
| US Pacific | America/Los_Angeles | UTC-8 |
| UK | Europe/London | UTC |
| Central Europe | Europe/Paris | UTC+1 |
| India | Asia/Kolkata | UTC+5:30 |
| China | Asia/Shanghai | UTC+8 |
| Japan | Asia/Tokyo | UTC+9 |
| Australia East | Australia/Sydney | UTC+10 |
Source
Time zone data: IANA Time Zone Database (tz database), as implemented in the browser's Intl API (ECMA-402). UTC offset notation follows ISO 8601.
FAQ
How does it handle daylight saving time?
Automatically. It uses the IANA time zone rules in your browser for the exact date you enter, so the same city can show UTC-5 in January and UTC-4 in July.
Why does it use city names instead of EST or PST?
Abbreviations are ambiguous (IST can mean India, Ireland or Israel) and change with daylight saving time. City-based IANA names are precise.
What happens if I enter a time that does not exist?
On the day clocks spring forward, one hour is skipped. The tool shows a notice and moves the time to the first valid moment after the skip. For a time that occurs twice when clocks fall back, it uses the earlier one and says so.
Is my data sent anywhere?
No. The conversion runs in your browser and nothing you enter is sent to a server.