Time Difference Calculator
Pick two places to see how many hours apart their clocks are right now. Daylight saving time is included, and the chart below shows the weeks when the gap is different.
London is 5 hours ahead of New York
When it's 9:00 AM in New York, it's 2:00 PM in London.
Their 9-to-5 working days overlap for 3 hours: 9:00 AM – 12:00 PM in New York, which is 2:00 PM – 5:00 PM in London.
- New York2:05 AM
- London7:05 AM
How the difference changes
The two places change their clocks on different dates, so the gap moves when either one does:
- Sunday, October 25, 2026London clocks go back 1 hour at 2:00 AM. London is then 4 hours ahead of New York.
- Sunday, November 1, 2026New York clocks go back 1 hour at 2:00 AM. London is then 5 hours ahead of New York.
- Sunday, March 14, 2027New York clocks go forward 1 hour at 2:00 AM. London is then 4 hours ahead of New York.
- Sunday, March 28, 2027London clocks go forward 1 hour at 1:00 AM. London is then 5 hours ahead of New York.
Common time differences
Click a pair to open it in the calculator. The first line is the difference right now.
| Places | Time difference |
|---|---|
| New York and London | London is 5 hours ahead of New York.4 hours Oct 25 – Nov 1, Mar 14 – Mar 28; 5 hours the rest of the year. |
| New York and Los Angeles | Los Angeles is 3 hours behind New York.The same all year. |
| London and India | India is 4 hours 30 minutes ahead of London.5 hours 30 minutes Oct 25 – Mar 28; 4 hours 30 minutes Mar 28 – Oct 25. |
| New York and India | India is 9 hours 30 minutes ahead of New York.10 hours 30 minutes Nov 1 – Mar 14; 9 hours 30 minutes Mar 14 – Nov 1. |
| New York and Tokyo | Tokyo is 13 hours ahead of New York.14 hours Nov 1 – Mar 14; 13 hours Mar 14 – Nov 1. |
| London and Sydney | Sydney is 10 hours ahead of London.11 hours Oct 25 – Mar 28; 10 hours Oct 3 – Oct 25, Mar 28 – Apr 4; 9 hours Apr 4 – Oct 3. |
| Los Angeles and London | London is 8 hours ahead of Los Angeles.7 hours Oct 25 – Nov 1, Mar 14 – Mar 28; 8 hours the rest of the year. |
| Chicago and London | London is 6 hours ahead of Chicago.5 hours Oct 25 – Nov 1, Mar 14 – Mar 28; 6 hours the rest of the year. |
| London and Dubai | Dubai is 3 hours ahead of London.4 hours Oct 25 – Mar 28; 3 hours Mar 28 – Oct 25. |
| New York and Beijing | Beijing is 12 hours ahead of New York.13 hours Nov 1 – Mar 14; 12 hours Mar 14 – Nov 1. |
| Los Angeles and Tokyo | Tokyo is 16 hours ahead of Los Angeles.17 hours Nov 1 – Mar 14; 16 hours Mar 14 – Nov 1. |
| New York and Sydney | Sydney is 15 hours ahead of New York.16 hours Nov 1 – Mar 14; 15 hours Oct 3 – Nov 1, Mar 14 – Apr 4; 14 hours Apr 4 – Oct 3. |
How to work out a time difference
Every clock is set to an offset from Coordinated Universal Time (UTC). Subtract one offset from the other and you have the difference. In July, London is on UTC+1 and New York on UTC−4: 1 − (−4) = 5, so London is 5 hours ahead. In January London is on UTC+0 and New York on UTC−5, which is still 5 hours.
Some offsets are not whole hours. India is UTC+5:30 all year, so it is 4 hours 30 minutes ahead of London in summer and 5 hours 30 minutes ahead in winter. Newfoundland is UTC−3:30 (UTC−2:30 in summer), Iran UTC+3:30, Adelaide UTC+9:30 (UTC+10:30 in summer) and Nepal UTC+5:45.
Why the difference changes during the year
Places that use daylight saving time move their clocks forward an hour in their summer, but not on the same dates:
- United States and CanadaSecond Sunday in March to the first Sunday in November, at 2:00 AM local time.
- UK and European UnionLast Sunday in March to the last Sunday in October, at 1:00 AM UTC everywhere at once.
- Southeastern AustraliaFirst Sunday in October to the first Sunday in April, during the southern summer.
So New York and London are 4 hours apart, not 5, for about three weeks in March and one week around the start of November. Sydney's clocks move the opposite way to Europe's, so London and Sydney are 9, 10 or 11 hours apart depending on the month. Many places, including India, China, Japan, the Gulf states and most of Africa, never change their clocks; the gap to them moves only when the other place changes.
Ahead or behind?
A place that is ahead has a later clock time. When New York is on daylight time, Tokyo is 13 hours ahead: 8:00 PM on Tuesday in New York is 9:00 AM on Wednesday in Tokyo. If the difference is more than the hours left in the day, the place ahead is already on the next date; the calculator says so when that is the case right now.
Related
Sources
- 15 U.S.C. § 260a — Advancement of time (daylight saving period)
- GOV.UK — When do the clocks change?
- Directive 2000/84/EC on summer-time arrangements
- NSW Government — Daylight saving
- IANA Time Zone Database
Last checked October 21, 2026.