Western European Summer Time

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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:

Western European Summer Time is also known by other names:

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.

The start and end dates of the scheme are somewhat asymmetrical in terms of daylight hours: the vernal time of year with a similar amount of daylight to late October is mid-February, well before the start of summer time. The asymmetry reflects temperature more than the length of daylight.

Ireland does not observe a summer time[5], but rather observes Standard Time during the summer months and changes to UTC+0 for the purposes of Daylight Savings. However, as Ireland's winter time period begins on the last Sunday in October and finishes on the last Sunday in March, the result is the same.


Contents

Usage

The following countries and territories use Western European Summer Time during the summer, between 1:00 UTC on the last Sunday of March and 1:00 UTC on the last Sunday of October.

  • Canary Islands, regularly since 1980 (rest of Spain is CEST, i.e. UTC+2)
  • Faroe Islands, regularly since 1981
  • Ireland
    • 1916–1939 summers IST
    • 1940–1946 all year IST
    • 1947–1968 summers IST
    • 1968–1971 all year IST
    • 1972— summers IST
  • Portugal
    • 1977–1992 WEST
    • 1993–1995 CEST
    • 1996— WEST (except Azores, UTC)
  • The United Kingdom
    • 1916–1939 summers BST
    • 1940–1945 all year BST (1941–1945 summers BDST=BST+1)
    • 1946 summer BST
    • 1947 summer BST (1947 summer BDST=BST+1)
    • 1948–1968 summers BST
    • 1968–1971 all year BST
    • 1972— summers BST

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