Time zones of Europe in relation to UTC:

blue	Western European Time (UTC+0) Western European Summer Time (UTC+1)
light blue	Western European Time (UTC+0)
red	Central European Time (UTC+1) Central European Summer Time (UTC+2)
yellow	Eastern European Time (UTC+2) Eastern European Summer Time (UTC+3)
orange	Kaliningrad Time (UTC+3)
green	Moscow Time (UTC+4)

Light colours indicate countries that do not observe summer time.

Central European Summer Time (sometimes called Central European Daylight Time) is the name for a time zone. It is a daylight saving time. Some of the countries that have Central European Time shift their clocks forward one hour, during the summer months and shift it one hour backwards during winter months.

A research station called Troll in Antarctica uses this time zone in the winter, but uses Greenwich Mean Time in the summer.