View current time in multiple cities around the world

See the local date and time in several IANA zones at the same instant.

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ToolWorld Clock
Input
Output
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Preview

How it works

One UTC instant is formatted separately in each selected IANA zone through Intl.DateTimeFormat. The zone database supplies the offset and daylight-saving rule in force at that instant instead of adding a fixed number of hours.

  • Ten major cities appear when the zone list is empty.
  • The current instant is used unless an ISO reference instant is supplied for a reproducible comparison.

Worked example

New York and Tokyo at one instant
Compare two zones against a fixed UTC instant
Input
											Cities: America/New_York,Asia/Tokyo
Reference time: 2026-01-15T12:00:00Z
Output
												=== World Clock ===
Reference: 2026-01-15T12:00:00.000Z

New York         Thu, Jan 15, 2026 at 07:00:00 AM
Tokyo            Thu, Jan 15, 2026 at 09:00:00 PM

When to use this

Distributed support handovers compare New York, London, and Singapore; release plans check Tokyo’s local date; and itineraries align departures and arrivals across zones.

Edge cases

  • America/New_York is UTC−5 in January but UTC−4 during daylight time, so a fixed-offset table is wrong for part of the year.
  • Asia/Kolkata has a half-hour offset, so whole-hour arithmetic loses 30 minutes.
  • An unknown IANA identifier is reported beside that row rather than silently replaced with the browser zone.

References