Time Zone Converter

How to use the time zone converter

1. Your own time zone is detected automatically and pinned to the top row, so every comparison starts from the time you already know.
2. Add a city from the dropdown. Each one gets its own row showing the current hour, the UTC offset, and whether daylight saving time is in effect.
3. Drag along the strip, scroll it, or use the arrow keys to preview a different hour. Every row moves together, so you can read off what 3pm in one city means everywhere else.
4. Set your working hours and the overlap bar marks the hours everyone on the board is available — the quickest way to schedule a call across time zones.

Time difference calculator

The number of hours between two places is not fixed. Countries move their clocks on different dates — Europe and North America switch on different weekends, the southern hemisphere switches in the opposite direction, and much of Asia and Africa does not switch at all. A gap of five hours in January can be four hours in April.

This converter reads the current rules for every zone instead of assuming a constant offset, so the difference it shows is the one that actually applies on the date you are looking at. Change the date and the whole board recalculates, daylight saving time included.

What time zone am I in?

Your browser already knows. The board detects your zone automatically and shows it as the first row — no location permission required. If you want the IANA zone name, the abbreviation and the exact UTC offset written out, along with what to do when the detected zone looks wrong, there is a page for that.

Frequently asked questions

How do I calculate the time difference between two time zones?

Subtract one UTC offset from the other. London at UTC+00:00 and New York at UTC−05:00 gives a five-hour difference, with New York behind. The catch is that offsets move with daylight saving time, so the reliable method is to compare the two zones on the specific date you care about — which is what the board above does for you.

Does the converter account for daylight saving time?

Yes. Every row uses the real rules for its zone, including the exact date each country moves its clocks. Pages for individual cities and states also list the next clock change, and comparison pages flag whether the difference between two places stays constant all year or shifts twice.

What is GMT, and how does it relate to UTC?

GMT is a time zone; UTC is the standard the world's clocks are measured against. In everyday use they point at the same moment, UTC+00:00. One practical wrinkle: the United Kingdom is on GMT only in winter and moves to UTC+01:00 in summer, so London time and GMT are not the same thing for half the year.

How do I know what time zone I am in?

Your device already carries the setting, and this site reads it from your browser without asking for your location. The detected zone appears as the top row of the board, and the dedicated page spells out the zone name, offset and abbreviation, plus how to check the value in your operating system if it looks wrong.

Can I compare more than two cities at once?

Yes. Add as many cities as you need and each one gets its own row. The overlap indicator keeps working across all of them, so you can find a single meeting slot for a team spread over several continents.