Free tool
Time Difference Calculator
How many hours ahead or behind is another city? Pick two places to see the exact time difference, today and after the next clock change.
London
New YorkNew York is 5 hours behind London.
London to New York time conversion
New York is 5 hours behind London. When it is 9:00 in London, it is 04:00 in New York.
Daylight saving time changes
- From 25 October 2026: New York is 4 hours behind London.
- From 1 November 2026: New York is 5 hours behind London.
- From 14 March 2027: New York is 4 hours behind London.
- From 28 March 2027: New York is 5 hours behind London.
Best time to call
Working hours (9:00–17:00) overlap from to in London, which is to in New York.
| London | New York |
|---|---|
| −1 day | |
| −1 day | |
| −1 day | |
| −1 day | |
| −1 day | |
Popular time differences
How time differences work
Every place on Earth sets its clocks to an offset from Coordinated Universal Time (UTC). The time difference between two cities is simply the gap between their two offsets – London is UTC+0 in winter and New York is UTC−5, so New York is 5 hours behind. Because many countries move their clocks for daylight saving time on different dates, the difference can change for a few weeks each spring and autumn. This calculator always uses the rules that apply on today’s date.
Frequently asked questions
How do I calculate the time difference between two cities?
Find each city’s UTC offset and subtract one from the other. For example India is UTC+5:30 and the UK is UTC+0 in winter, so India is 5 hours 30 minutes ahead. The calculator above does this for you, including daylight saving time.
Why does the time difference change during the year?
Countries that use daylight saving time move their clocks forward in spring and back in autumn, and they do it on different dates. The USA changes in March and November, Europe in late March and October, and many countries never change at all.