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.

Greenwich Mean Time (GMT) is an internationally standardized time format. It is the main time zone in several countries, including the United Kingdom, the Republic of Ireland and Portugal. GMT has the same time as UTC, but there are differences between the two. Technically, GMT is a time zone, while UTC is a time standard.