World Clock

How do time zones work?

Earth is theoretically divided into 24 time zones, each offset by one hour. Coordinated Universal Time (UTC) is the global reference. New York is UTC-5 (winter) and UTC-4 (summer), London is UTC+0 (winter) and UTC+1 (summer).

Daylight Saving Time (DST)

DST is applied in many countries to take advantage of daylight. In Canada and the US, clocks spring forward one hour on the 2nd Sunday of March and fall back on the 1st Sunday of November.

Practical time differences

New York → London: +5h (winter) | New York → Tokyo: +14h | London → Dubai: +4h | London → New York: -5h. This information is essential for scheduling international meetings and calls.