Global Time


GreenwichMeanTime.com

Custom Search

 
 

GMT  World Time  Time Zones  UK Time  London Time  CET  USA time  CST  EST  PST  LA time  DST  China Time  India Time  Japan Time 
 

USA, Canada clocks on Daylight Saving Time until Sunday 2 November 2014 at 2am local time
Europe: Clocks on Summer Time until Sunday 26 October 2014 at 01:00 (1am) GMT
UK Clocks on British Summer Time (BST) until Sunday 26 October 2014 at 01:00 (1am) GMT


Greenwich Mean Time

Time Zones
Daylight Saving Time
GMT to
Time Gadgets
World Clock
Longest Day

Up

Up
Cities
Countries no-DST
Time zone conversion
GMT timestamp
Global Time
Search
PC Clock Software
Media Info
GMT
What is GMT?
Time Information
Time Wise
GMT Time: Twitter

 

wwp

wwp us wwp uk wwp eu

GMT

Global Time

Global Time Zones

Time Zones are regions in the Earth that use the same local time. Conventionally, people compute their local time as an offset from UTC (Coordinated Universal Time).  UTC replaced GMT (Greenwich Mean Time), primarily because UTC is considered an actual time zone. UTC is a high precision atomic time standard, which measures time by the nanosecond. UTC has standard seconds as defined by the International Atomic Time, and has leap seconds (time particle that measures time not on the passage of seconds, but on the Earth's angular rotation) that are announced at irregular intervals for the compensation of geographical occurrences, such as the earth's slowing rotation.

GMT, on the other hand, is the mean solar time at the 0 degree longitude (known as the Prime Meridian). Solar-based time has been used all throughout the history of time determination, the most known of which is the sundial. However, the flaw lies in how the mean solar time is determined by the rotation of the Earth. The Earth's rotation is not constant, and time is ideally, a constant thing, wherever a person is in the earth. Knowing this, atomic clocks were charged annually to closely match GMT. However, in 1972, a new system was discovered, and this system involved the use of leap seconds, as mentioned above.

As a general rule, adjacent time zones are exactly one hour apart. Standard time zones are geometrically defined with the subdivision of the Earth's sphere into 24 lunes (wedge shaped sections), surrounded by meridians that are 15 degrees of longitude apart from each other, hence the general rule of one-hour time differences between neighbouring regions.

There are exceptions, however, for the benefit of those with geographical and political issues. Some time zones are irregularly-shaped, due to establishment of political boundaries, and seasonal time changes (DST or Daylight Saving Time).

Time Zones are typically defined with two variations. The first meaning of time zone is a uniform representation of a particular region, where the time is determined offset from a global reference (usually UTC). On the other hand, one that more people are familiar with, a time zone is a representation of a region with a common, ever consistent local time, despite seasonal fluctuations of the offset.

There are a total of 84 time zones in the world, including time zones with DST. Provided that DST is not in effect, most time zones may be written in short form as UTC +/-n (or GMT+/-n), such as Melbourne Australia, UTC+10, 22:00, and Los Angeles, California, U.S.A. UTC-8, 04:00.

News:

Philippines Typhoon

UNICEF: Your donation today could help us give life-saving support to a child affected by Typhoon Haiyan, or provide support in their community during the aftermath.

 Click here to donate


Related Websites:
Time in

USA + Canada

Atlantic Time (Canada) | Eastern Time (EST) | Central Time (CST) | Mountain Time (MT) | Pacific Time (PST) | Alaska Time (AKST) | Hawaii Time (HST) | Daylight Saving Time (DST)

Europe

Central European Time (CET) | Eastern European Time (EET) | Western European Time (WET) | British Summer Time   (BST)

Asia / Pacific

China Time (CST) | India Time (IST) | Japan Time (JST)

Countries on GMT

Europe (Winter only)

UK | Ireland | Portugal

Africa

St Helena | Burkina Faso | Gambia | Ghana | Guinea | Guinea-Bissau | Ivory Coast | Liberia | Mali | Mauritania | Morocco | Sao Tome | Senegal | Togo | Western Sahara

Time in USA Cities

New York, NY Time | LA Time | Chicago Time | Houston Time | Philadelphia Time
Phoenix Time | San Antonio Time | San Diego Time | Dallas Time | San Jose Time
Jacksonville Time | Indianapolis Time | San Francisco Time | Austin Time | Columbus Time
Fort Worth Time | Charlotte Time | Detroit Time | El Paso Time | Memphis Time
Baltimore Time | Boston Time | Seattle Time  | Washington DC Time

 

Back ] GMT ] Next ]

Cities ] Countries no-DST ] Time zone conversion ] GMT timestamp ] [ Global Time ] Search ] PC Clock Software ] Media Info ] GMT ] What is GMT? ] Time Information ] Time Wise ] GMT Time: Twitter ]

Up ]

Greenwich Mean Time (GMT)

British Summer Time (BST)

Greenwich Mean Time (GMT)

GMT-1 | GMT-2 | GMT-3 | GMT-4 | GMT-5 | GMT-6 | GMT-7 | GMT-8 | GMT-9 | GMT-10 | GMT-11 | GMT-12
GMT-0 | GMT | GMT+0
GMT+1 | GMT+2 | GMT+3 | GMT+4 | GMT+5 | GMT+6 | GMT+7 | GMT+8 | GMT+9 | GMT+10 | GMT+11 | GMT+12 | GMT+13 | GMT+14

  
Time Zones
Africa, Asia, Australia, Canada, Caribbean, Europe
European Union, Pacific / Oceania, Russia, South America, UK, USA
Why not?
  • Give us your feedback and comments using the Visitors Book
  • Bookmark this page NOW!
  • Make a link to us from your website?
  • Advertise? Please contact us via the Feedback Form
Mirror Sites

USA: GreenwichMeanTime.com
UK: GreenwichMeanTime.co.uk
Canada: Greenwich-Mean-Time.ca
India: GreenwichMeanTime.in
Netherlands: GreenwichMeanTime.nl
Rest of World GreenwichMeantime.com

  
  


Thank you for visiting the wwp global network of websites!
 

  
Please read the legal page and data policy page. credits page.
Copyright 1995 - 2014 Greenwich2000.ltd.uk - Greenwich2000  Get  wwp GMT
All trade-marks acknowledged

 
Custom Search
Delivered by wwp.GreenwichMeanTime.com US time server (va1201)


sitemap.xml.gz

Last revised: April 09, 2014 14:57 +0100 GMT  Worldwide Photographs Network  Site Map 

Global Time