Time Zone Converter

Convert a date and time from one time zone to another, with daylight saving handled automatically, and see the same moment in major world cities.

How to use the time Zone Converter

  1. Pick the date and time you want to convert. The page starts with the current time.
  2. Choose the time zone that date and time is in. It defaults to your own.
  3. Choose the time zone to convert to. Zones are listed by region and city, for example Europe/London or Asia/Kolkata.
  4. The result updates instantly as you type. There is no button to press.
  5. Use Copy result to copy the figures, or Copy link to share a link that reopens the time Zone Converter with the same inputs.

How it works

Scheduling a call across continents means knowing not just the time difference but whether either place is on daylight saving time that day. This converter uses the IANA time zone database built into your browser, the same data used by phones and computers worldwide, so daylight saving rules and historical changes are applied automatically for the exact date you pick.

Zones are named by region and a representative city, such as America/Chicago or Asia/Tokyo, rather than by abbreviations. Abbreviations are ambiguous: "IST" can mean India, Ireland or Israel Standard Time, and "CST" can mean US Central or China Standard Time. To convert, the tool first works out which exact moment your local time represents in the source zone, then displays that moment in the target zone and in a list of major cities.

Some offsets are not whole hours: India is UTC+5:30, Nepal UTC+5:45, and parts of Australia UTC+9:30. Times that fall in the hour skipped when clocks spring forward don't exist locally. The converter shifts them forward by the size of the change.

Formula

UTC time = local time − offset(source zone, that moment) target time = UTC time + offset(target zone, that moment) difference = offset(target) − offset(source)

Offsets are looked up for the specific date, so the difference between two cities can change during the year when only one of them observes daylight saving time.

Example

A meeting at 9:00 am in New York on July 15 is 13:00 UTC, because New York is on Eastern Daylight Time (UTC−4) in summer. That is 2:00 pm in London (UTC+1), 6:30 pm in Mumbai (UTC+5:30) and 10:00 pm in Tokyo (UTC+9). In January, New York is on UTC−5 and London on UTC+0, so the same 9:00 am meeting is 2:00 pm in London but 7:30 pm in Mumbai.

Frequently asked questions

Does the converter handle daylight saving time?

Yes. It uses your browser's built-in time zone database, which knows the daylight saving rules for each zone and date.

What is the difference between UTC and GMT?

For everyday purposes they are the same time. UTC is the modern scientific standard. GMT is also the name of the UK's winter time zone, and the UK moves to BST (UTC+1) in summer.

Why are time zones shown as city names?

City-based names, from the IANA database, are unambiguous and track each region's daylight saving rules. Abbreviations such as CST or IST are shared by several different zones.