World Clock & Timezone Converter

View current times across multiple timezones and convert between them instantly.

How to Use World Clock & Timezone Converter

1

Add time zones

Search and add cities or time zones to your clock display.
2

View current times

See the live current time in all added time zones.
3

Compare times

Quickly compare times across multiple locations at a glance.

Tested tool guide Tested browser tools Checked August 16, 2026

What World Clock & Timezone Converter does, with a checked example

Pick a handful of cities or UTC offsets and this displays what time it is right now in each one, updating live, or lets you enter a specific date and time in one zone to see the equivalent moment in the others. It resolves each zone's current offset from a standard timezone database, so daylight saving is applied automatically for whichever zone observes it. The most common surprise: a conversion near midnight can shift the result onto the previous or next calendar date, not just a different hour, so the date shown next to each time matters as much as the clock face.

Worked example

A concrete input and expected output from the current implementation.

Input

Convert 3:00 PM in New York on August 16, 2026 to London and Tokyo time.

Expected output

London: 8:00 PM, August 16, 2026 (BST, UTC+1). Tokyo: 4:00 AM, August 17, 2026 (JST, UTC+9).

On that date New York is on Eastern Daylight Time (UTC-4) and London is on British Summer Time (UTC+1), so 3:00 PM EDT is 7:00 PM UTC, which is 8:00 PM in London and, at UTC+9 with no DST in Japan, 4:00 AM the following calendar day in Tokyo.

How the result is produced

Offset lookup per zone

Each zone is matched to its current UTC offset using a standard timezone database that encodes daylight saving start and end dates by region. Because DST rules differ by country and can change in some years, the same named zone can sit at a different offset depending on the date entered, not a fixed number of hours from UTC.

Conversion by way of UTC

A conversion works by first expressing the entered time in UTC using the source zone's offset for that date, then reapplying the target zone's offset for that same instant. When the offset difference crosses midnight, the calendar date in the result advances or rolls back accordingly rather than staying fixed to the input date.

Good uses

Scheduling a call across time zones like New York, London, and Tokyo without doing offset arithmetic by hand
Checking whether it's a reasonable hour to call or message someone in another country before doing so
Converting a meeting, flight, or event time listed in one timezone into your own local time

Limits and checks

The result depends on the date entered, not just the zones chosen - the same pair of cities can be an hour apart differently on either side of a DST transition
Not every region observes daylight saving the same way - Japan and India stay fixed year-round with no DST anywhere in the country, while Arizona is split internally (most of the state skips DST, but the Navajo Nation within it does observe it) - so offsets that look inconsistent between similar zones can still be correct
A converted time can land on the previous or next calendar day; reading only the clock time and skipping the date can make same-day and next-day events look identical

Common questions

Does it account for daylight saving time automatically?

Yes, for whatever date is entered - it applies the DST rule in effect for that zone on that specific date, not just today's rule. This matters when converting a time months out, since a zone's offset relative to another can shift between now and then as one or both change clocks.

Why do two cities sometimes show the same clock time but different dates?

Zones on opposite sides of the International Date Line, or far enough apart in offset, can be a full calendar day apart even when the hour looks similar. That's expected, not a bug - check the date shown next to each city's time, not just the hour and minute.

References and verification

The example and behavioral notes were checked against the browser implementation. Standards and primary references below define the relevant format, formula, or platform behavior.