Enter any two cities to instantly see the time difference, live local clocks, an hour-by-hour conversion table, and the best window for scheduling calls across time zones. Most Popular Time Comparisons Below are the most frequently searched city pairs. Each page includes live clocks, a full hour-by-hour conversion table, DST impact notes, and scheduling advice. Time Difference from New York Time Difference from London Time Difference from Los Angeles Time Difference from Tokyo Time Difference from Dubai Time Difference from Singapore Time Difference from Sydney Time Difference from Hong Kong Time Difference from Mumbai Time Difference from Paris More City Comparisons How Time Differences Are Calculated Every location on Earth is assigned a time zone defined as an offset from Coordinated Universal Time (UTC) . The time difference between two cities is simply the gap between their UTC offsets. For example, New York operates on UTC-5 in winter and UTC-4 in summer, while London uses UTC+0 in winter and UTC+1 in summer. During winter the gap is 5 hours; during summer it stays at 5 hours because both shift. But during the brief windows when only one city has switched, the gap changes to 4 or 6 hours. When Time Differences Change Daylight saving time (DST) is the main reason time differences shift throughout the year. Countries that observe DST "spring forward" (gaining an hour of evening daylight) and "fall back" at different dates. During these transition weeks, the usual time difference between two cities can be off by one hour from what you expect.

Both cities observe DST — the difference stays the same most of the year, but shifts briefly if they switch on different dates. Only one city observes DST — the difference changes by exactly 1 hour twice a year. Neither city observes DST — the difference is constant year-round. Edge Cases: Unusual Offsets Not all time zones follow whole-hour offsets. India uses UTC+5:30, Nepal uses UTC+5:45, and Iran uses UTC+3:30. When one city is on a half-hour offset, the time difference will include 30 or 45 minutes, making conversion less intuitive. Our calculator handles these automatically. Tips for Working Across Time Zones Find the overlap: Identify the window where both cities fall within 9:00–17:00. Our pair pages highlight this automatically. Use UTC as a neutral anchor: When coordinating three or more time zones, express meeting times in UTC to avoid confusion. Bookmark your pair page: Each comparison page updates live, so you can check both clocks at a glance. Account for DST transitions: Mark the DST switch dates for both cities on your calendar. Our pages flag DST status in real time. For a visual overview of all time zones, see the world time zone map . Current Time Lookup — find the time in any city worldwide Current UTC Time — the global reference clock Current GMT Time — Greenwich Mean Time All Time Zones — complete list with offsets UTC vs GMT — how the two standards differ What Is a Time Zone? — the fundamentals explained You can also check today's date in any country on DateToday.info or view a global live clock at WorldWideClock.com . We use cookies to improve your experience. By using this site, you agree to our Privacy Policy .