Time zone converter
A time zone converter translates a clock time in one part of the world to the equivalent time in another, accounting for the UTC offset difference between the two zones.
Converted time
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How to use
- Pick the From zone (where the time is now) and the To zone (where you want to know it).
- Enter a date and time.
- The equivalent local time in the destination zone appears instantly, including any date change.
How time zone conversion works
Every time zone has a fixed offset from UTC (Coordinated Universal Time). To convert between any two zones, translate through UTC:
UTC time = Local time − UTC offset
Target local time = UTC time + Target offset
Common UTC offsets (standard time)
| Zone | Cities | Offset |
|---|---|---|
| PST | Los Angeles, Vancouver | UTC−8 |
| MST | Denver, Phoenix | UTC−7 |
| CST | Chicago, Mexico City | UTC−6 |
| EST | New York, Toronto | UTC−5 |
| UTC / GMT | London (winter), Reykjavik | UTC+0 |
| CET | Berlin, Paris, Madrid | UTC+1 |
| EET | Athens, Helsinki, Kyiv | UTC+2 |
| MSK | Moscow, Istanbul | UTC+3 |
| GST | Dubai, Abu Dhabi | UTC+4 |
| IST | Mumbai, Delhi | UTC+5:30 |
| CST (China) | Beijing, Shanghai, Hong Kong | UTC+8 |
| JST | Tokyo, Seoul | UTC+9 |
| AEST | Sydney, Melbourne | UTC+10 |
| NZST | Auckland | UTC+12 |
Worked examples
3:00 PM New York to Tokyo
- UTC = 15:00 − (−5) = 20:00 UTC
- Tokyo = 20:00 + 9 = 05:00 the next day
9:00 AM London (UTC+0) to San Francisco (UTC−8)
- UTC = 09:00 − 0 = 09:00 UTC
- San Francisco = 09:00 + (−8) = 01:00 the same day
11:30 PM Berlin (UTC+1) to Sydney (UTC+10)
- UTC = 23:30 − 1 = 22:30 UTC
- Sydney = 22:30 + 10 = 08:30 the next day
Notes
- Daylight saving time — this calculator uses standard (winter) offsets. Most of the U.S., Europe, and parts of the Southern Hemisphere shift their clocks by one hour in summer, creating a temporary offset. Dates fall between DST boundaries matter: mid-March to early November the U.S. and Europe are one hour ahead of what the tables show. For real-time DST-aware conversion, use your device’s world clock.
- India, China, and most of Asia don’t observe DST; their offset is year-round.
- UTC vs. GMT — in everyday use they’re interchangeable. Technically GMT is a time zone (London’s winter time), while UTC is the global time standard. Servers and aviation use UTC; news and casual use stick with GMT.
- Half-hour and 45-minute offsets exist — India (UTC+5:30), Newfoundland (UTC−3:30), Nepal (UTC+5:45) — make sure you’re picking the right zone, not just the nearest round hour.
Frequently asked
Why might the date change?
If the offset difference carries the clock past midnight, the converted time is on the next or previous day.
Does this account for daylight saving time?
This calculator uses standard (winter) UTC offsets. DST adds +1 hour to most US and European zones in summer. For real-time DST-aware conversion, use your device's world clock.
What is UTC?
Coordinated Universal Time (UTC) is the global time reference. All other zones are expressed as UTC offset — for example, New York is UTC−5 in winter (EST) and UTC−4 in summer (EDT).
What is the difference between EST and EDT?
EST (Eastern Standard Time) is UTC−5, used in winter. EDT (Eastern Daylight Time) is UTC−4, used in summer. This calculator shows standard offsets.
How do I share my conversion?
Click "Share with my numbers" to copy a URL with your zones and time saved.