Time Zone Calculator

Find the time difference between two zones and see the current local time in each — handy for planning calls, flights and long drives across time zones.

Reading the Result

The difference tells you how far the To zone is ahead of or behind the From zone. If Tokyo is “9 h ahead” of London, a 9 am call in London lands at 6 pm in Tokyo. The live clocks update from your device’s time.

A Note on Daylight Saving

These zones use standard (non-DST) offsets with representative cities. Many regions shift their clocks by an hour in summer, and they don’t all switch on the same dates — so during changeover periods the real difference can be an hour off. Always double-check around late March and late October for a critical meeting or flight.

Crossing Zones on a Journey

Driving or flying a long way east or west changes the local clock as you go. Measure the distance of a long-haul trip with the distance between coordinates tool, and work out arrival in local time with the arrival time calculator.

Get Distance Tool

Download Distance Tool for iOS and start measuring in seconds.