UTC−01:00

As standard time (Northern Hemisphere winter)

Atlantic Ocean

• Portugal
• *Azores islands

As daylight saving time (Northern Hemisphere summer)

North America

• Greenland
• * Except areas around Danmarkshavn, and Pituffik (Thule)

As standard time (year-round)

Africa

Atlantic Ocean

• Cape Verde

Anomalies

Regions in UTC−02:00 longitudes using UTC−01:00 time

• The westernmost part of legal UTC-01:00 area in Ittoqqortoormiit Municipality
• Azores islands
• Cape Verde

Areas in UTC−01:00 longitudes using other time zones

Using UTC−02:00

• The easternmost tip of Greenland

Using UTC±00:00

• Liberia
• Sierra Leone
• Guinea
• Guinea-Bissau
• Senegal
• The Gambia
• Sahrawi Arab Democratic Republic
• Most of Mauritania
• Southwestern most part of Mali
• The very westernmost part of Ivory Coast

• Madeira
• Canary Islands

• Most of Iceland, except the westernmost part, including northwest peninsula and main town of Ísafjörður
• Most of Portugal west of 7.5ºW, except the easternmost part, including cities such as Bragança and Guarda
• The northeastern part of Greenland, including Danmarkshavn
• Ireland west of 7.5ºW, including the cities of Cork, Limerick, and Galway
• The westernmost tip of Northern Ireland, including the county town of County Fermanagh, Enniskillen
• The westernmost island of the Faroe Islands, Mykines
• The extreme westerly portion of the Outer Hebrides, in the west of Scotland; for instance, Vatersay, an inhabited island and the westernmost settlement of Great Britain, lies at 7°54'W. If uninhabited islands or rocks are taken into account St Kilda, west of the Outer Hebrides, at 8°58'W, and Rockall, at 13°41'W, should be included.

Using UTC+01:00

• Southwestern part of Morocco, including Casablanca
• Most part in Moroccan Sahara

• Parts of Galicia, Extremadura and Andalucia, Spain
• Jan Mayen, Norway