What time zone is used by Iceland all year?

Iceland uses Greenwich Mean Time (GMT) all year, at UTC+00:00, and does not observe daylight saving time. Its national clock remains on the same offset in winter and summer.

Iceland adopted UTC+00:00 year-round in 1968. Before then, the country used UTC−01:00 as its standard time and had periods of daylight saving time. The change was intended to end clock changes while keeping Iceland more closely aligned with Western Europe for travel, communication and business.

The answer is sometimes confused with Western European Time, a broader regional label that can refer to the same UTC+00:00 winter offset but may involve daylight-saving changes elsewhere. “Iceland Standard Time” is not the usual official name; GMT is the conventional name used for Iceland’s year-round clock setting.

Geographically, much of Iceland lies near the UTC−01:00 solar-time zone. By choosing UTC+00:00, Iceland gets later sunrises and sunsets by the clock than its longitude alone would suggest. Its IANA identifier is Atlantic/Reykjavik.