Time zones
24h
AM/PM
Convert times between time zones worldwide. Useful for international meetings, travel and working with colleagues in different countries.
Frequently asked questions
UTC (Coordinated Universal Time) is the international standard for timekeeping and is based on atomic clocks. GMT (Greenwich Mean Time) is the solar time at the Greenwich meridian. In practice, UTC and GMT are nearly identical, but UTC is the official standard.
New York (EST/EDT) is 5 hours behind London (GMT/BST) in winter. During daylight saving time this gap stays at 5 hours, though it can briefly become 4 or 6 hours around clock-change transitions, since the US and UK switch on different dates.
In the US, clocks spring forward one hour on the second Sunday in March and fall back on the first Sunday in November. Most states observe daylight saving time; Hawaii and Arizona (except the Navajo Nation) do not.
The contiguous US has four main time zones: Eastern (EST/EDT, UTC−5/−4), Central (CST/CDT, UTC−6/−5), Mountain (MST/MDT, UTC−7/−6) and Pacific (PST/PDT, UTC−8/−7). Alaska and Hawaii have their own zones.