Western European Summer Time

daylight savings time zone
BST redirects here, for the Bangladeshi time zone, see Bangladesh Standard Time

Western European Summer Time (WEST) is a summer daylight saving time scheme, 1 hour ahead of Coordinated Universal Time. It is used in the following places:

Time zones of Europe in relation to UTC:
Blue Western European Time (UTC±00:00)
Western European Summer Time (UTC+01:00)
Light Blue Western European Time (UTC±00:00)
Red Central European Time (UTC+01:00)
Central European Summer Time (UTC+02:00)
Ochre Eastern European Time (UTC+02:00)
Eastern European Summer Time (UTC+03:00)
Yellow Kaliningrad Time (UTC+02:00)
Green Moscow Time / Turkish Time (UTC+03:00)
 Pale colours: Standard time observed all year
 Dark colours: Summer time observed

Western European Summer Time is also known by other names:

  • British Summer Time (BST) in the United Kingdom.
  • Irish Standard Time (IST)[1] (Am Caighdeánach na hÉireann (ACÉ)[2]) in Ireland. This is sometimes called Irish Summer Time (Am Samhraidh na hÉireann).

The scheme runs from the last Sunday in March to the last Sunday in October each year. At both the start and end of the schemes, clock changes take place at 01:00 UTC. During the winter, Greenwich Mean Time (UTC+0) is used.


  1. "Standard Time Act, 1968". Archived from the original on 2007-11-19. Retrieved 2008-08-21.
  2. "AN TACHT UM AM CAIGHDEÁNACH, 1968". Archived from the original on 2011-11-03. Retrieved 2008-08-21.