International Time Zones & Time Zone Converters
A time zone is a longitudinal strip of the Earth's surface, stretching from pole to pole and sharing the same time of day or night. The Earth requires 24 hours to make one complete rotation on its axis. Thus the direct rays of the Sun pass through one degree of longitude every 4 minutes. Because the time zones extend around the world, the 24th zone has to lie next to the first one. The time zones on either side of this line are 24 hours apart. Thus, a person who moves from east to west across the line immediately "loses" a day. Below are links to information about international time zones and time zone converter resources.
American Express: World Time Zones Guide
Learn about how to calculate the time and date anywhere in the world.
Greenwich 2000 Time Channel Guide
Visit the home page of Greenwich Mean Time for the current time.
Istituto Elettrotecnico Nazionale, Italy: Daylight Saving Time Guide
Get the official current date and time in Italy, with information about Daylight Saving Time.
Istituto Elettrotecnico Nazionale, Italy: World Time Zones Guide
See time zones explained, with a bright map displaying their demarcations.
United States Department of Navy: United States Naval Observatory: World Time Zones Guide
View Observatory map of world time zones and information about U.S. standard time zone law.
United States National Science Foundation: North American Time Zones and Greenwich Mean Time Guide
Learn how to convert Greenwich Mean Time to local time zones in North America.
University of Virginia, Charlottesville: Essential Time Zone and Resources Guide
Learn the essential distinctions of the logic and history of time zones.
World Clock and Information Guide, Norway
See current local times in cities around the world with notations for Daylight Saving Time.
World Local Times Guide, Australia
Check the current local time for the world's countries and many of its islands.
Worldtime.com: World Atlas and Interactive Time Guide
Use interactive world atlas for current local time in several hundred cities.