World Time Zones
Explore and understand every time zone across the globe. Search by city, region, or offset to find the exact time anywhere in the world.
Understanding Time Zones
Everything you need to know about global timekeeping.
How Time Zones Work
The Earth is divided into 24 standard time zones, each roughly 15 degrees of longitude wide. Time zones are measured relative to the Prime Meridian (0° longitude) in Greenwich, London. As you move east, time advances; moving west, time goes back.
UTC and GMT Explained
GMT (Greenwich Mean Time) is a time zone officially used in some European and African countries. UTC (Coordinated Universal Time) is not a time zone, but a highly precise time standard that keeps the world's clocks synchronized. They share the same current time.
Daylight Saving Time (DST)
DST is the practice of moving clocks forward by one hour during warmer months to extend evening daylight. It's commonly observed in North America and Europe, but largely ignored in regions near the equator. Dates for DST changes vary by country.
Unusual Time Zones
Not all time zones are offset by whole hours. Several countries use 30-minute or 45-minute offsets from UTC to better align with solar time. Examples include India (UTC+5:30), Nepal (UTC+5:45), and the Chatham Islands in New Zealand (UTC+12:45).
Time Zone Abbreviations Reference
Commonly used alphabetic time zone codes and their meanings.
Frequently Asked Questions
Common questions about world time zones.
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