Time ZonesWhat you can do here
- Convert a time between any two places and see every hour of the day side by side.
- See India time against other cities, with the best hours to call.
- Check when clocks change in 2026 and 2027.
- Look up a time zone abbreviation such as EST, GMT or IST.
- Browse by country or by UTC offset.
How this site works out the time
Nothing is fetched from a time server. Your own phone or computer already knows the exact moment, and it carries the time zone rules of the whole world, the same public database that this site is built from. The page asks your browser what that moment is called in Tokyo, Dubai or Toronto and shows the answer, updated every second. This means the clocks keep working with no connection once the page is open, and that they are only as right as your own device's clock. The pages for each place add what a clock alone cannot tell you: the dates on which clocks go forward and back, the difference from India and other countries in winter and in summer, the hours of the working day that two places share, and how far the clock in that place runs ahead of or behind the sun.
The data covers 418 zone areas in 247 countries and territories. Short guides in plain words are under Learn.
Questions
How many time zones are there in the world?
There are 24 whole-hour steps around the globe, but countries choose their own time, and some use half or quarter hours. In practice 39 different UTC offsets are in use during 2026, from UTC−11 to UTC+14.
What is UTC?
UTC means Coordinated Universal Time. It is the world's reference time. Every time zone is described as so many hours ahead of or behind UTC. India is UTC+5:30.
Why is India's time 30 minutes off from most countries?
India uses one time for the whole country, set to the longitude 82.5° east, which passes near Prayagraj. That line is five and a half hours ahead of Greenwich, so Indian Standard Time is UTC+5:30.
Does India have daylight saving time?
No. India keeps the same time all year. The difference with countries that do change their clocks, such as the United States and the United Kingdom, moves by one hour twice a year.