Time Difference Calculator
How many hours apart are two time zones? See the live current times in both zones and today's business hours overlap.
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Time Differences Between Major Cities
The time difference between two locations is determined by their UTC offsets. Subtract one offset from the other to get the gap in hours. UTC offsets are not always whole numbers — India is UTC+5:30, Iran is UTC+3:30, Nepal is UTC+5:45, and the Chatham Islands off New Zealand are UTC+12:45.
The difference between two cities can change throughout the year if they observe Daylight Saving Time on different schedules. US cities shift their clocks on different dates than European cities, creating brief periods each spring and autumn when the transatlantic time gap is one hour different from its usual value.
Quick Reference: Common Time Differences
New York ↔ London: 5 hours (winter) or 4 hours (summer). EST is UTC-5; GMT is UTC+0. London is ahead.
New York ↔ Paris/Berlin: 6 hours (winter) or 5 hours (summer). CET is UTC+1.
New York ↔ Dubai: 9 hours (winter EST) or 8 hours (summer EDT). GST is UTC+4, fixed year-round.
New York ↔ Mumbai: 10.5 hours (EST) or 9.5 hours (EDT). IST is UTC+5:30, fixed year-round.
New York ↔ Singapore: 13 hours (EST) or 12 hours (EDT). SGT is UTC+8, fixed.
New York ↔ Tokyo: 14 hours (EST) or 13 hours (EDT). JST is UTC+9, fixed.
New York ↔ Sydney: 16 hours (EST) or 14–15 hours (EDT/AEDT). Varies with both US and Australia DST.
Los Angeles ↔ New York: Always exactly 3 hours. Both follow US DST on the same schedule.
London ↔ Tokyo: 9 hours (GMT) or 8 hours (BST). JST is UTC+9, fixed.
The Effect of Daylight Saving Time on Differences
When only one of two cities observes DST — or when they observe it on different dates — the time difference changes temporarily. Here is what to watch for:
US vs UK (March): The US switches to EDT on the second Sunday of March. The UK switches to BST on the last Sunday of March, typically 2–3 weeks later. During this gap, the New York–London difference is 4 hours instead of the usual 5.
US vs Europe (October–November): Europe switches back to standard time on the last Sunday of October. The US does not switch until the first Sunday of November. During this gap, the US–Europe difference reverts to its winter value 1–2 weeks early.
Fixed-offset regions: Japan, China, India, UAE, and most of the Middle East do not change clocks. When the US shifts, the difference between New York and Tokyo changes from 14 to 13 hours and back, even though Tokyo does nothing.
Frequently Asked Questions
How many hours is New York behind London?
5 hours in winter (EST UTC-5 vs GMT UTC+0) and 4 hours in summer (EDT UTC-4 vs BST UTC+1). For 2–3 weeks each spring and autumn the difference is temporarily 4 or 5 hours as one region shifts before the other.
How many hours is New York behind Tokyo?
14 hours in winter (EST vs JST), 13 hours in summer (EDT vs JST). Japan does not observe DST, so the offset changes only when New York shifts its clocks.
How many hours is LA behind New York?
Always exactly 3 hours — Pacific Time is always 3 hours behind Eastern Time. Both follow US DST on the same schedule, so the gap never changes.
Does the time difference change with DST?
Yes, when the two zones observe DST on different schedules. US vs Europe shifts by 1 hour for 2–3 weeks each spring and autumn. Differences to countries that don't observe DST (Japan, India, UAE) also change when the US shifts clocks.
How do I calculate the time difference between two cities?
Find the current UTC offset of each city, then subtract: (offset 2) − (offset 1). New York EST is UTC-5, Tokyo JST is UTC+9: 9 − (−5) = 14 hours. The calculator above shows this live including today's DST adjustment.