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.
The UK (GMT/BST) is 5 hours ahead of New York (EST/EDT) in winter. During British Summer Time (BST, March–October) the gap stays at 5 hours, though it can briefly become 4 or 6 hours around daylight saving transitions when the UK and US change clocks on different dates.
Daylight saving time means putting the clocks forward one hour in spring. The aim is to make better use of daylight in the evenings. In the UK, British Summer Time (BST, UTC+1) runs from the last Sunday in March to the last Sunday in October.
The most widely used time zones are UTC/GMT (UK, West Africa), CET/CEST (most of Europe), EST/EDT (US East Coast), PST/PDT (US West Coast), JST (Japan), IST (India, UTC+5:30) and AEST/AEDT (eastern Australia). The world has more than 30 official time zones.