World Clock
View current time in multiple time zones with our real-time world clock. See local time, UTC, and major cities around the world.
World Time Zones:
About Time Zones
What are Time Zones?
Time zones are regions of the Earth that have the same standard time. The world is divided into 24 time zones, each covering approximately 15 degrees of longitude. Time zones help coordinate activities across different geographical locations.
UTC and GMT
UTC (Coordinated Universal Time) is the primary time standard by which the world regulates clocks and time. GMT (Greenwich Mean Time) is the mean solar time at the Royal Observatory in Greenwich, London. UTC and GMT are often used interchangeably in casual conversation.
How Time Zones Work
Each time zone has an offset from UTC, ranging from UTC-12 to UTC+14. For example, Eastern Standard Time (EST) is UTC-5, meaning it's 5 hours behind UTC.
Daylight Saving Time
Many regions observe Daylight Saving Time (DST), where clocks are moved forward by one hour during warmer months. This practice aims to make better use of daylight and conserve energy.
Major Time Zones
| Time Zone | Abbreviation | UTC Offset | Major Cities |
|---|---|---|---|
| Eastern Standard Time | EST | UTC-5 | New York, Miami, Toronto |
| Central Standard Time | CST | UTC-6 | Chicago, Dallas, Mexico City |
| Mountain Standard Time | MST | UTC-7 | Denver, Phoenix, Calgary |
| Pacific Standard Time | PST | UTC-8 | Los Angeles, Seattle, Vancouver |
| Greenwich Mean Time | GMT | UTC+0 | London, Dublin, Lisbon |
| Central European Time | CET | UTC+1 | Paris, Berlin, Rome |
| Eastern European Time | EET | UTC+2 | Athens, Cairo, Helsinki |
| Japan Standard Time | JST | UTC+9 | Tokyo, Seoul, Osaka |
| Australian Eastern Time | AET | UTC+10 | Sydney, Melbourne, Brisbane |
Interesting Time Facts
- Largest Time Zone: China uses a single time zone (UTC+8) despite spanning 5 geographical time zones
- Most Time Zones: France has the most time zones (12) due to its overseas territories
- No Daylight Saving: Arizona and Hawaii don't observe Daylight Saving Time in the US
- Half-Hour Zones: Some regions use 30-minute offsets (e.g., India is UTC+5:30)
- International Date Line: Located roughly at 180° longitude, where the date changes
- Leap Seconds: Occasionally added to UTC to account for Earth's irregular rotation
Frequently Asked Questions
What's the difference between UTC and GMT?
UTC is based on atomic time and is more precise, while GMT is based on astronomical observations. For most practical purposes, they are the same.
Why do we have time zones?
Time zones ensure that noon corresponds roughly to when the sun is highest in the sky in each region, making daily schedules more natural and consistent.
How accurate is this clock?
Our clock syncs with your device's system time, which is typically synchronized with internet time servers and accurate to within a few milliseconds.
Can I use this for scheduling meetings?
Yes! Use our world clock to see what time it will be in different locations when scheduling international meetings or calls.