Last updated
Last updated
A time zone is an area which observes a uniform for , and purposes. Time zones tend to follow the boundaries between and their instead of strictly following , because it is convenient for areas in frequent communication to keep the same time.
All time zones are defined as offsets from (UTC), ranging from to . The are usually a whole number of hours, but a few zones are offset by an additional 30 or 45 minutes, such as in , and .
Some areas of higher use for about half of the year, typically by adding one hour to local time during and .
Source: Wikipedia