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View current time in multiple cities simultaneously. Add and remove cities, see UTC offsets, and track DST. 25+ major cities with live second-by-second updates.
A world clock displays the current time in multiple cities and time zones simultaneously, accounting for Daylight Saving Time (DST) transitions.
11:46:02 AM
Wed, Apr 29
GMT-4
04:46:02 PM
Wed, Apr 29
GMT+1
12:46:02 AM
Thu, Apr 30
GMT+9
01:46:02 AM
Thu, Apr 30
GMT+10
Formula
Local Time = UTC + Time Zone Offset (± DST Adjustment)UTC = Coordinated Universal Time, the global time standard
Time Zone Offset = hours (and sometimes minutes) ahead or behind UTC
DST Adjustment = typically +1 hour during Daylight Saving Time periods
Worked Example
Converting between New York and Tokyo
Did you know? Time zones were standardized internationally in 1884 at the International Meridian Conference in Washington, D.C. Before that, each city set its own local time based on the sun's position.
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