Time zone converter and world clock

What time is it in London, Tokyo or Los Angeles?

This time zone converter shows the time around the world, converts a time from one city to another and finds a meeting slot that works across continents. Every time difference is exact on the date you pick, daylight saving time included. It all runs in your browser and nothing is sent.

How to use it

1. World clock. "Your local time" shows your device's clock. Each city shows its time, its difference from you ("+5 h", "+10:30 h"), "tomorrow" or "yesterday" when the date is not the same, and day or night (night runs from 9 PM to 7 AM).
2. In "Add a city", type a city (Kathmandu), a country (Japan) or a zone ID (Pacific/Chatham). Arrows reorder the list; the cross removes a city. Your list stays on this device, and "Default list" brings back the starting 8 cities.
3. Convert a time. Set the "Date", the "Time", the "From city" and the "To city". You get the time at the destination, the difference on that date and the same moment in every city of your list. "Now" fills in the current hour in the starting city; "Swap" switches the two cities.
4. Plan a meeting. Add 2 to 5 cities with "Add a city to the meeting" and pick a "Meeting date". The timeline shades office hours (9 AM to 6 PM) in each city, and the "Overlap" row ticks the hours that suit everyone.
5. "Copy link" gives you an address holding your cities and the time to convert.

Time zones and UTC in plain words

The Earth turns once every 24 hours, so noon does not reach every place at once. Each time zone is set against a common reference, UTC (Coordinated Universal Time). New York is UTC−5 in winter, London is UTC+0, Tokyo is UTC+9. So in January Tokyo is 9 − (−5) = 14 hours ahead of New York.

Why the difference changes during the year

The United States and Canada start daylight saving time on the second Sunday in March and end it on the first Sunday in November. Europe moves its clocks on the last Sunday in March and the last Sunday in October. In between, the gap shifts. On March 20, 2026, New York has been on daylight time since March 8 while London stays on GMT until March 29, so the usual 5 hours shrinks to 4.

Many places never change their clocks: Japan, China, India, most of Africa, Iceland, most of Arizona and Hawaii. In the southern hemisphere the seasons are reversed: Sydney is on daylight time from October to April.

Half-hour time zones

Some zones are offset by half or three quarters of an hour. India is UTC+5:30, Iran UTC+3:30, Newfoundland UTC−3:30 and Nepal UTC+5:45. On January 15, 2026 at noon in London, it is 5:30 PM in New Delhi and 5:45 PM in Kathmandu.

Useful differences in winter (January)

Setting up a call between continents

Between New York and London in January, office hours overlap from 9 AM to 1 PM in New York, which is 2 PM to 6 PM in London: four hours. Add Paris and the window shrinks to three hours, from 9 AM to noon in New York. Add Sydney and there is no shared slot: someone has to start early or stay late.

Time differences and travel

Flight arrival times are always given in the local time of the destination. After a long flight east or west, your body often takes a few days to settle into the new rhythm, which is what people call jet lag.

Frequently asked questions

Does the converter handle daylight saving time?

Yes. It applies the rules of each time zone on the date you choose, so a July date uses summer time and a January date uses standard time.

What happens with a time that does not exist?

On March 8, 2026, clocks in New York jump from 2:00 AM to 3:00 AM, so 2:30 AM never happens. The tool says so and converts 3:30 AM instead. When a time happens twice in the fall, it uses the first one.

Is my city list saved?

Yes, on this device and in this browser. Use "Copy link" to share it or open it elsewhere.

What is the time difference between New York and London?

Five hours most of the year, London being ahead. It drops to four hours for about three weeks in March and one week around early November.