World Clock
Current time in major cities worldwide — updates every second.
Frequently Asked Questions
What is UTC / GMT?▼
UTC (Coordinated Universal Time) and GMT (Greenwich Mean Time) are essentially the same for most purposes. UTC is the modern standard that all time zones are defined relative to. For example, New York is UTC−5 (EST) or UTC−4 (EDT during daylight saving).
Why do some countries not observe daylight saving time?▼
Daylight saving time (DST) is a practice of advancing clocks by 1 hour in summer to extend evening daylight. Many countries near the equator don't observe it because day length varies little year-round. Countries like Japan, China, India, and most of Africa do not use DST.
What is the International Date Line?▼
The International Date Line is an imaginary line at roughly 180° longitude (the antimeridian). Crossing it eastward moves you back one calendar day; crossing westward moves you forward one day. It's why Samoa and Tonga can be a day ahead of Hawaii despite being geographically close.
How many time zones are there?▼
There are 24 main time zones based on 15° longitude bands, but in practice there are about 40 distinct UTC offsets used worldwide. Some countries use half-hour (India, UTC+5:30) or quarter-hour (Nepal, UTC+5:45) offsets.