All Time Zones around the Globe

Planet Earth is more or less a ball shape and might be devided into 360 degrees steps called Longitudes. To find a common way of marking these Longitudes, per international definition the longitude that goes through the english city of Greenwich is defined as 0 degrees. If you start from there going east the angle is positiv between 0 and +180 degrees, in the opposite way going west you'll find negative angles.
Another definition based on the rotation of the earth says that every 15 degrees a new time zone starts, which means one hour difference to the previous zone, meaning that after a full rotation you passes all 24 time zones.
Normally country borders doesn't match with longitudes, therefore there are a lot of country related special regulations, e.g. in India, which is 5.5 hours ahead of UTC or China, covering theoretically about 5 time zones, but using only one common time zone in the whole country.

In March 2010 Russia changed the numbers of Time Zones in its country from 11 to 9, for the reason of having smaller differences to Moscow Time. Here comes the current Time Zone Map followed by the former one to compare.