Are daylight-saving changes handled?

Yes. Times are computed with your browser built-in IANA time-zone database — the same one your operating system uses — so daylight-saving transitions are applied automatically.

Which time zones can I add?

Any IANA zone your browser knows, listed by region and city (for example America/New_York or Pacific/Auckland). Older browsers fall back to a curated list.

What is the difference between this and the multi-city clock?

This tool lets you pick raw IANA zone identifiers like Europe/London or Asia/Tokyo directly, which is useful for developers and precise scheduling. The multi-city version presents the same data labelled by familiar city names.

What is a UTC offset?

It is how many hours a zone is ahead of or behind Coordinated Universal Time. London is UTC+0 in winter and UTC+1 in summer; New York is UTC-5 or UTC-4. The clock shows each zone's current offset.

Can I show 12-hour AM/PM time?

Yes. Toggle the 12-hour option to display AM and PM, or leave it off for 24-hour time across every zone in your list.

How do I compare two zones quickly?

Add both and look at each one's "ahead of or behind your device" value. The gap between those two numbers is the time difference between the zones.

Is any clock data fetched from a server?

No. The current time comes from your device clock and all conversions happen locally — nothing is fetched or sent.

World Clock — Multiple Time Zones

See every time zone at once

This world clock compares the live time across any IANA time zones side by side. You add the zones you care about by their standard identifier — such as Europe/London, America/New_York, or Pacific/Auckland — and each row updates every second. It is built for developers, remote teams, and anyone scheduling across regions who wants precise zone control rather than just city names.

How it works

Each second, the tool takes your device’s current instant and renders it in every selected zone using the browser’s built-in IANA time-zone database via the Intl API. That database encodes every zone’s daylight-saving rules and historical offsets, so transitions are applied automatically and even fractional offsets (like Asia/Kolkata at UTC+5:30) are correct. Every row shows the zone’s current UTC offset and the difference versus your own device.

Column	Meaning
Local time	Live time in that zone
UTC offset	Current hours from UTC
Vs your device	Hours ahead of or behind you

Example

Add Asia/Tokyo and America/Los_Angeles. Tokyo shows UTC+9 and Los Angeles UTC-7 (in summer), a 16-hour gap. So when it is 10:00 Monday in Los Angeles, it is already 02:00 Tuesday in Tokyo — instantly visible without manual maths.

Conversions use your browser’s built-in time-zone database, so daylight-saving transitions are handled for you — and no clock data is ever fetched or uploaded.