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- The time zones are regions of the earth that have the same standard time
- In 1884 , the International Prime Meridian Conference, agreed to divide the world into 24 time zones standard time zones.
- Each zone is a narrow belt running from north to south, with an west-east extent of 15 degrees of a longitude.
- The time zones are based on the Greenwich Mean Time (GMT) or Universal Time (UT) , which is the time at the Prime Meridian or 0° longitude
- The time zones are numbered from 1 to 24, starting from the Prime Meridian and going eastward and westward
- The time in each time zone is an exact number of hours ahead or behind GMT, except for a few countries that have a difference of half an hour
- The time zones are adjusted to match the political boundaries of the countries that fall within them
- Some countries with a large longitudinal extent have more than one time zone, such as Russia , which has 11 time zones
