Time zones and daylight saving: how to get them right
UTC, offsets, daylight saving and timestamps: what you need to schedule meetings and calculate dates without mistakes.
World clock
Current time in several time zones and a converter.
Runs in your browser
Madrid
Your zone--:--:--
London
--:--:--
New York
--:--:--
Mexico City
--:--:--
Bogota
--:--:--
Tokyo
--:--:--
Convert a time between zones
| Madrid | Thursday, 1 January 2026 at 09:00 |
|---|---|
| London | Thursday, 1 January 2026 at 08:00 |
| New York | Thursday, 1 January 2026 at 03:00 |
| Mexico City | Thursday, 1 January 2026 at 02:00 |
| Bogota | Thursday, 1 January 2026 at 03:00 |
| Tokyo | Thursday, 1 January 2026 at 17:00 |
What it does: World clock
See the current time in the cities you care about and how far ahead or behind they are. Time zones come from the official IANA database, so daylight saving is applied automatically in each country on the right dates.
With the converter you can pick a date and time in one zone and see what time it is everywhere else — perfect for planning international meetings.
How to use it
- Your time zone is detected automatically.
- Add cities by typing their name or IANA zone.
- To convert a time, choose the date, time and source zone.
Examples
London–New York meeting
Pick 15:00 in Europe/London to see the time in New York; the gap is usually 5 hours but briefly 4 when the US and UK change clocks on different weekends.
Call with Tokyo
Add Asia/Tokyo to see at a glance whether it's day or night there.
Limits, formulas and assumptions
- IANA zones (like Europe/London) are used instead of fixed offsets (UTC+1), because offsets change with daylight saving and with each country's decisions.
- The zones you add are saved only in your browser (local storage) for next time.
- Accuracy depends on your browser's time-zone database and your device clock.
Frequently asked questions
Why does the time difference change during the year?
Because countries change their clocks on different dates, and some never do.
Can I use abbreviations like EST or CET?
No: abbreviations are ambiguous and don't say whether daylight saving applies. Use a city name instead.
Is my location stored?
No. Only the time zone set on your device is read, and it never leaves it.
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