World Clock: What Time Is It Over There?
A world clock is only useful if it knows about daylight saving. The browser version does, because it uses the built-in time-zone database rather than a fixed offset.
What is the World Clock?
Pick a city and the tool shows its current time. In the browser it uses the built-in Intl time-zone database, which handles daylight saving for you. Outside the browser it falls back to a standard-offset table, which is approximate around daylight-saving changes — check a live clock before a critical meeting.
How to use it
- Choose a city.
- Click Show World Time.
- In the browser, the time comes from the built-in time-zone database.
Worked example
At 12:00 UTC, Tokyo (UTC+9 standard) shows 21:00, and London shows 12:00 in winter or 13:00 while daylight saving applies.
Why can a fixed offset be wrong?
Because many places move their clocks for daylight saving, so a standard offset is off by an hour for part of the year.
Frequently asked questions
Does the browser version handle daylight saving?
Yes. It uses the Intl time-zone database, which applies the current daylight-saving rules for each city.
What does the fallback table do?
Outside the browser it adds a standard offset to UTC, which is approximate around daylight-saving changes.