How to use the World Clock
- Your own time is shown first, based on your device’s time zone setting.
- Type a city, country or time zone name in the search box and pick a result to add a clock.
- Read each card: local time and date, a sun or moon for day or night, the UTC offset and the difference from your time.
- Remove a city with the × button, switch between 12-hour and 24-hour format, and come back any time: your list is remembered.
Features
- Digital and analog clocks for every city, updating each second
- Time difference from you, including half-hour and 45-minute zones
- Day or night indicator and “tomorrow” or “yesterday” labels
- Search 110+ cities or any IANA time zone by its current name
- Daylight saving time handled automatically
- 12 or 24-hour format; your cities are saved on this device
How time zones work
The world is divided into time zones defined by their offset from Coordinated Universal Time (UTC), the global reference time kept by atomic clocks. London in winter is UTC+0, New York in winter is UTC−5, Dubai is UTC+4 and Tokyo is UTC+9. Offsets are not always whole hours: India uses UTC+5:30, Nepal UTC+5:45 and parts of Australia UTC+9:30. Countries choose their own time, so zone boundaries follow politics and geography rather than straight lines on a map, and China, despite spanning about five geographic zones, uses a single official time.
Daylight saving time
Many countries move their clocks forward one hour in spring and back in autumn, but not on the same dates, and most of the world does not do it at all. The United States and Canada switch on the second Sunday in March and the first Sunday in November, while the European Union switches on the last Sunday in March and October. For a few weeks each year the gap between New York and London is therefore four hours instead of five. In the Southern Hemisphere, places such as Sydney and Santiago observe daylight saving during their summer, which is the northern winter. This clock uses the official time zone database built into your browser, so all of these rules are applied automatically.
| City | Standard time | Daylight saving time |
|---|---|---|
| Los Angeles | UTC−8 | UTC−7 |
| New York | UTC−5 | UTC−4 |
| London | UTC+0 | UTC+1 |
| Paris, Berlin | UTC+1 | UTC+2 |
| Dubai | UTC+4 | Not observed |
| Karachi | UTC+5 | Not observed |
| Mumbai, Delhi | UTC+5:30 | Not observed |
| Tokyo | UTC+9 | Not observed |
| Sydney | UTC+10 | UTC+11 |
Time zone names
Computers identify zones with names from the IANA time zone database, such as America/New_York or Asia/Kolkata, which record every historical change for that region. Some zones have been renamed over the years, for example Asia/Calcutta to Asia/Kolkata and Europe/Kiev to Europe/Kyiv. This tool always shows the current names, and searching for either spelling finds the right zone.
Scheduling across time zones
- Add every participant’s city, then look for times that fall in daytime (sun icon) for everyone.
- Watch the “Tomorrow” label: a Monday morning call from California is already Monday night or Tuesday in parts of Asia.
- When writing an invitation, include the time zone or UTC offset, not just “3 pm”.
- Around daylight saving changes, double-check meetings that repeat weekly.
To convert one specific time between zones, use the Time Zone Converter. For counting down to an event, try the Countdown Timer.
Frequently asked questions
Does the world clock handle daylight saving time?
Yes. Times come from the time zone database built into your browser, which includes the daylight saving rules for every region, so clocks change automatically on the right dates.
How is my local time determined?
From your device’s time zone setting. If your own clock looks wrong, check the date, time and time zone settings on your computer or phone.
Why is a city 30 or 45 minutes off from others?
Some countries use offsets that are not whole hours, such as India (UTC+5:30), Nepal (UTC+5:45) and Newfoundland in Canada (UTC−3:30). The difference shown on each card includes these minutes.
Can I find a city that is not in the list?
Search by country or by the name of a nearby major city in the same time zone. You can also type any IANA time zone name, such as America/Halifax.
Are my cities saved?
Yes, in this browser’s local storage, so they appear the next time you open the page on this device. Nothing is uploaded.