Western European Time (WET) is the time zone covering parts of western and northwestern Europe, including the following countries and regions:

• Canary Islands (rest of Spain is CET, i.e. WET+1)
• Faroe Islands
• northeastern Greenland (Danmarkshavn and surrounding area)
• Iceland
• Portugal
• Republic of Ireland
• United Kingdom (where the terms GMT and BST are always used)

During winter months, WET corresponds to Universal Time (UTC); however in the summer, most (but not all) of the above places move one hour ahead to European Summer Time (UTC+1). Officially the Republic of Ireland is on UTC+1, but goes to UTC in winter, and for all practical purposes uses the same time as the United Kingdom.

UTC (sometimes called Zulu time or Z time and formerly called Greenwich Mean Time) also covers part of west Africa:

• Burkina Faso
• Côte d'Ivoire
• The Gambia
• Ghana
• Guinea
• Guinea-Bissau
• Liberia
• Mali
• Mauritania
• Morocco
• Saint Helena
• São Tomé and Príncipe
• Senegal
• Sierra Leone
• Togo