What is the time difference between New York and London?

Usually 5 hours: New York is UTC-5 in winter and UTC-4 in summer, while London is UTC+0 in winter and UTC+1 in summer. For a few weeks in March and October/November the gap is 4 hours because the US and Europe switch DST on different dates — the tool accounts for this automatically.

Is daylight saving time handled?

Yes. Conversions use the IANA time zone database built into your browser, which includes historical and current DST rules for every region. Offsets change with the date you pick, e.g. London is UTC+0 in winter and UTC+1 in summer.

How do I add a city that isn't listed?

Type a city or zone name (such as Dubai, Singapore or Europe/Berlin) in the Add box, choose from the suggestions and click Add. Zones are named after a representative city, so Asia/Shanghai covers all of China and America/New_York covers US Eastern Time.

Is anything uploaded? Does it need internet?

Nothing is uploaded. All conversions run locally in your browser and keep working offline once the page is loaded; your city list is stored only in this browser.

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🌐Time Zone Converter & World Clock - Convert Time Between Cities

Scheduling a call across continents or catching a live event abroad means doing time-zone math. This tool starts as a live world clock for Shanghai, UTC, New York, Los Angeles, London, Paris and Tokyo, updating every second. Turn off live mode and pick any date and time in a source zone (say, "tomorrow 9 PM in New York") to see what time it is everywhere else — and whether it's the previous or next day. Rules come from the IANA time zone database built into your browser, so daylight saving time is handled automatically. Search more than 400 zones, add or remove cities, and your list is remembered locally.

Free · No sign-up · Runs in your browserLast updated: 2026-10-26

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How to use Time Zone Converter

1Choose the source time zone (defaults to your computer's zone)
2Keep Live on for the current time, or pick a specific date and time
3Read the equivalent times, UTC offsets and day shifts below; search to add cities or remove them

FAQ

What is the time difference between New York and London?: Usually 5 hours: New York is UTC-5 in winter and UTC-4 in summer, while London is UTC+0 in winter and UTC+1 in summer. For a few weeks in March and October/November the gap is 4 hours because the US and Europe switch DST on different dates — the tool accounts for this automatically.
Is daylight saving time handled?: Yes. Conversions use the IANA time zone database built into your browser, which includes historical and current DST rules for every region. Offsets change with the date you pick, e.g. London is UTC+0 in winter and UTC+1 in summer.
How do I add a city that isn't listed?: Type a city or zone name (such as Dubai, Singapore or Europe/Berlin) in the Add box, choose from the suggestions and click Add. Zones are named after a representative city, so Asia/Shanghai covers all of China and America/New_York covers US Eastern Time.
Is anything uploaded? Does it need internet?: Nothing is uploaded. All conversions run locally in your browser and keep working offline once the page is loaded; your city list is stored only in this browser.