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World Clock

Compare live times across time zones.

Use the World Clock tool

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What this world clock does

World Clock shows the current time in a set of cities and time zones, updating once a second. Each row includes the weekday, the date and the zone's current offset from UTC, so you can see at a glance who is in business hours and who is not.

Offsets come from the browser's time zone database, which applies daylight-saving rules and historical changes. A zone that recently changed its rules may be out of date until the browser is updated. The clock uses your device time as its reference, so a wrong system clock produces wrong results.

Why use it

  • Check working hours before scheduling a call.
  • Compare a client's local time with your own.
  • Watch a deadline across several regions.

How to use it

  1. 1The tool starts with a few common zones and adds your local zone.
  2. 2Pick a city from the list to add it.
  3. 3Remove zones you do not need.
  4. 4Compare times and offsets in the list.

Worked examples

Scheduling a call

Input

London, New York and Tokyo

Output

Local times plus each zone's current offset, showing who is likely asleep.

Daylight saving

Input

New York in summer

Output

The offset shows UTC−4 rather than the winter UTC−5.

Common mistakes

  • Assuming an offset stays constant all year.
  • Using an abbreviation such as CST, which is ambiguous across regions.
  • Trusting the clock on a device with the wrong time set.

Frequently asked questions

Does it handle daylight saving?
Yes, through the browser's time zone data. Keep the browser updated for recent rule changes.
Can I add any city?
The list covers common IANA time zones. Cities that share a zone show the same time.
Why is my local zone different from what I expected?
Your operating system's time zone setting determines it. Change it in system settings if it is wrong.
Is anything sent to a server?
No. The clock runs locally.

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