London will stay on GMT until Sunday, March 28, 2010 at 1:00 AM when clocks are moved to Sunday, March 28, 2010 at 02:00:00 BST
Time zone offset: UTC
GMT is in the same time zone as Coordinated Universal Time (UTC)
Note that some places observe daylight saving time/summer time during summer, and are therefore using BST (United Kingdom) or IST (Ireland) instead in the summer. See below for details.
Time zone abbreviations: GMT, UTC
Full name is Greenwich Mean Time
UTC – Coordinated Universal Time (Alternative)
Email time zone indicator: +0000
An email sent from someone in the GMT time zone will have the time zone listed as "+0000" in the headers of the email. (However, "+0000" does not have to be in GMT, as other time zones could have the same UTC offset).
For actual dates DST might be observed, look at the examples below
Where and when is GMT observed?
GMT is used all year in these European countries
Iceland
GMT is used during winter only in these European countries
Ireland
United Kingdom - main islands
England, Wales, Scotland, Northern Ireland
Time zone maps are under development and will be available later