Free Time Zone Converter
Convert time between world time zones instantly. Compare US, European, Asian, and Australian time zones side by side.
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Formula
Target Time = Source Time + (Target UTC Offset − Source UTC Offset)How to Convert Between Time Zones
Time zone conversion is straightforward once you know the UTC offsets. Each time zone is defined by its offset from Coordinated Universal Time (UTC). To convert, find the difference between the source and target UTC offsets and add or subtract that many hours from the source time.
This converter shows your entered time across 14 major time zones simultaneously, making it easy to schedule international calls, meetings, or see what time it is for friends and colleagues around the world.
US Time Zones
- Eastern (ET): UTC−5 (UTC−4 during DST) — New York, Miami, Atlanta, Boston
- Central (CT): UTC−6 (UTC−5 during DST) — Chicago, Houston, Dallas, Nashville
- Mountain (MT): UTC−7 (UTC−6 during DST) — Denver, Phoenix, Salt Lake City
- Pacific (PT): UTC−8 (UTC−7 during DST) — Los Angeles, Seattle, San Francisco
- Alaska (AKT): UTC−9 — Anchorage, Fairbanks
- Hawaii (HT): UTC−10 — Honolulu (no daylight saving time)
Key International Time Differences from US Eastern
Here are common differences from US Eastern Time (during standard time):
- London: +5 hours (noon ET = 5 PM London)
- Paris/Berlin: +6 hours (noon ET = 6 PM Paris)
- Dubai: +9 hours (noon ET = 9 PM Dubai)
- India: +10.5 hours (noon ET = 10:30 PM Mumbai)
- Tokyo: +14 hours (noon ET = 2 AM next day Tokyo)
- Sydney: +15 hours (noon ET = 3 AM next day Sydney)
Daylight Saving Time Considerations
Daylight saving time complicates conversions because not all regions observe it, and those that do may change on different dates. The US and Europe switch on different weekends, creating a brief period where the time difference changes. Countries near the equator generally don't observe DST. Always verify current offsets when scheduling across regions during March-April and October-November transitions.
Frequently Asked Questions
How many time zones are there in the world?
There are 24 standard time zones, but in practice there are over 38 because some regions use 30- or 45-minute offsets. India is UTC+5:30, Nepal is UTC+5:45, and several Australian zones use half-hour offsets. The International Date Line (roughly UTC+12/−12) is where the calendar date changes.
What is UTC and how is it different from GMT?
UTC (Coordinated Universal Time) and GMT (Greenwich Mean Time) are effectively the same for everyday use — both represent the time at 0° longitude. Technically, UTC is the modern standard based on atomic clocks, while GMT is the older astronomical standard. UTC is used as the global reference for all time zones.
What time is it in California when it's noon in New York?
California (Pacific Time) is 3 hours behind New York (Eastern Time). So noon in New York is 9:00 AM in California. During daylight saving time, both zones shift forward one hour, maintaining the 3-hour difference.
When does daylight saving time start and end?
In the US, DST begins the second Sunday of March (clocks spring forward 1 hour) and ends the first Sunday of November (clocks fall back). Europe observes it from the last Sunday of March to the last Sunday of October. Note: Arizona, Hawaii, and most US territories do not observe DST.
How do I schedule a meeting across time zones?
Find the overlap in business hours. For US East Coast and London (5-hour difference), 10 AM-12 PM ET works well (3-5 PM London). For US and Asia (12-16 hour difference), early morning US or late evening Asia are typically the only overlaps.