Greenwich Mean Time (also known as Western European Time or UTC) and British Summer Time (UTC+01:00) (also known as Western European Summer Time). Until the
two time zones and observes daylight saving time. Continental Portugal and Madeira use UTC+00:00, while the Azores use UTC–01:00. Daylight saving time (locally
Faroe Islands and Greenland, uses six time zones. UTC+01:00 as standard time, and UTC+02:00 as daylight saving time, with transition dates according to
Schiavenza, Matt (November 5, 2013). "China Only Has One Time Zone—and That's a Problem". The Atlantic. Archived from the original on August 22, 2018. Retrieved
notation is commonly used. In the IANA time zone database, Iceland is given one zone in the file zone.tab – Atlantic/Reykjavik. "IS" refer's to the country's