World Time Zone Converter

Enter any time and see it across 15 major cities instantly. Click a city to copy.

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This converter shows any time across 15 major world cities at once. Enter a time and date, pick your starting timezone, and the grid updates instantly. Daylight Saving Time and historical offsets are handled automatically by your browser's timezone engine - pick a winter date to see standard time, a summer date to see DST.

How time zones and DST actually work

Every place on Earth has an offset from UTC (Coordinated Universal Time, the modern replacement for GMT). New York is normally UTC−5, London is UTC+0, Tokyo is UTC+9, and so on. To find the time difference between two cities, subtract their offsets: Tokyo (+9) minus New York (−5) = 14 hours.

Daylight Saving Time shifts that offset by one hour for part of the year - typically spring through fall in countries that observe it. Most of the US, Canada, Europe, and parts of South America change clocks; most of Asia, Africa, and the Middle East do not. The exact transition dates vary: the US and Canada switch in March and November, Europe in March and October, and the dates aren't aligned, so the time difference between New York and London actually changes by one hour twice a year.

This is why "the time difference is X hours" is often subtly wrong. New York is 5 hours behind London for most of the year, but it's 4 hours behind for two windows in spring and fall when one country has switched and the other hasn't. The converter handles all of this automatically - the answer depends on the specific date you choose.

Common scheduling patterns
Daily standup across NY and London

9 AM Eastern is 2 PM in London (winter) or 1 PM (summer). A 10 AM ET standup keeps it inside business hours for both teams year-round.

US ↔ Tokyo collaboration

The overlap window is brutal: New York and Tokyo share roughly zero conventional business hours. The least-bad option is 8 AM ET (10 PM Tokyo) or 7 PM ET (9 AM Tokyo next day). Most US-Japan teams pick "morning for one side, evening for the other" and rotate.

Europe-wide meeting

10 AM Berlin is 9 AM London is 11 AM Athens - the entire EU is within two hours. Anything between 10 AM and 4 PM Central European Time works for everyone.

India ↔ US West Coast

Mumbai is 12.5–13.5 hours ahead of Los Angeles depending on DST. A 9 PM IST meeting in Mumbai is 8:30–9:30 AM PST in LA - usable for both sides.

Frequently asked questions
How do I convert a meeting time across time zones?
Enter the meeting time, pick your timezone from the dropdown, and click Convert. All 15 cities update instantly. Click any city card to copy that time to your clipboard for pasting into a calendar invite.
Does this tool account for Daylight Saving Time?
Yes. The converter uses your browser's IANA timezone database, which knows the DST rules for every region and the dates they apply. Pick a date in March, June, October, and December and you'll see different offsets where DST applies.
What time is 9am EST in London?
9 AM Eastern is 2 PM in London during winter (GMT) or 1 PM during summer (BST). The converter shows the correct value for the date you choose.
What is the time difference between New York and London?
5 hours for most of the year (NY is behind London). It briefly drops to 4 hours during the spring DST gap and again in fall - when one country has changed clocks but the other hasn't yet. Always check a specific date if precision matters.
What time is 9am EST in Tokyo?
9 AM EST in New York is 11 PM JST in Tokyo on the same date. Tokyo is UTC+9 year-round (no DST); New York is UTC−5 in winter and UTC−4 in summer.
What is the time difference between London and Dubai?
Dubai (GST, UTC+4) is 4 hours ahead of London in winter and 3 hours ahead during British Summer Time. Dubai does not observe Daylight Saving Time.
What time is 3pm UTC in New York?
3 PM UTC is 10 AM Eastern Standard Time in winter or 11 AM Eastern Daylight Time in summer.
Why do my calendar's time zones look different from this tool?
Some calendars store events in a fixed timezone offset rather than a city-based zone. If you fly across time zones, those events don't shift. The tool here uses IANA city-based zones, which is what most modern systems use.
Does UTC change?
No. UTC is the universal reference and never observes DST. Every other timezone is defined as an offset from UTC. When somewhere "switches to daylight saving time" they're temporarily using a different UTC offset.
What's the difference between GMT and UTC?
In casual usage they're treated as identical. Technically GMT is a time zone (used in the UK during winter) while UTC is a global time standard. For all practical scheduling, GMT = UTC+0.