Time Zone Converter
Instantly convert time between 30+ time zones worldwide with a handy reference table.
Time Zone Converter
Convert time between any two time zones
09:00 EST
14:00 GMT
+5 hours difference
Quick Reference
| EST | GMT |
|---|---|
| 00:00 | 05:00 |
| 03:00 | 08:00 |
| 06:00 | 11:00 |
| 09:00 | 14:00 |
| 12:00 | 17:00 |
| 15:00 | 20:00 |
| 18:00 | 23:00 |
| 21:00 | 02:00 (+1d) |
How to Use This Converter
Enter the time in 24-hour format (e.g., 14:30 for 2:30 PM). Select the source time zone (where the time is) and the destination time zone (where you want to know the time).
The converter shows the equivalent time and indicates if it falls on a different calendar day. Use the swap button to quickly reverse the conversion.
The quick reference table shows conversions for every 3 hours, making it easy to find meeting times across time zones.
Common Time Zone Conversions
US to UK: EST (New York) is 5 hours behind GMT (London). When it's 9 AM in New York, it's 2 PM in London.
US to India: EST is 10.5 hours behind IST (Mumbai). When it's 9 AM in New York, it's 7:30 PM in Mumbai.
US to Japan: EST is 14 hours behind JST (Tokyo). When it's 9 AM in New York, it's 11 PM the same day in Tokyo.
Tips for Working Across Time Zones
Use a world clock app on your phone to track 2-3 key time zones. Most phones let you add multiple clocks to your home screen.
Always specify the time zone when scheduling. "Let's meet at 3 PM EST" is clear. "Let's meet at 3 PM" is ambiguous in international contexts.
Be mindful of DST transitions. Not all countries observe Daylight Saving Time, and those that do change on different dates. Double-check during March/April and October/November.
Frequently Asked Questions
How many time zones are there?
There are 24 standard time zones based on 15° longitude intervals, but in practice there are over 30 because some regions use half-hour (India at UTC+5:30) or quarter-hour (Nepal at UTC+5:45) offsets. Some countries span multiple zones (Russia has 11).
What is UTC?
UTC (Coordinated Universal Time) is the global time standard. It replaced GMT as the reference point for all time zones. UTC+0 is the same as GMT. All other time zones are expressed as offsets from UTC (e.g., EST is UTC-5, JST is UTC+9).
What is the difference between GMT and UTC?
GMT (Greenwich Mean Time) and UTC are essentially the same time, but UTC is the modern scientific standard based on atomic clocks. GMT is the traditional name tied to the Royal Observatory in Greenwich, London. For practical purposes, GMT = UTC+0.
Does this converter handle Daylight Saving Time?
This converter uses standard time offsets. DST is not automatically applied because different regions observe DST on different dates (and some don't observe it at all). When DST is active, most zones shift forward by 1 hour (e.g., EST becomes EDT at UTC-4).
What is the International Date Line?
The International Date Line (IDL) runs roughly along 180° longitude in the Pacific Ocean. When you cross it going west, you advance one day. Going east, you go back one day. It zigzags around island nations to keep countries on the same date.
How do I schedule a meeting across time zones?
Find overlap in business hours. For US-Europe calls, 9-11 AM Eastern (2-4 PM London) works well. For US-Asia, early morning US or late evening Asia is typical. Use the reference table in this converter to quickly find convenient times for both sides.
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