Iceland uses Greenwich Mean Time (GMT), which is UTC+0 hours throughout the year.

Iceland does not observe Daylight Saving Time. The country remains on Greenwich Mean Time (GMT), UTC+0, year-round.

The time difference between Iceland and the United States varies depending on the U.S. time zone. For example, Iceland is 5 hours ahead of Eastern Standard Time (EST) and 8 hours ahead of Pacific Standard Time (PST).

Iceland shares its time zone (GMT, UTC+0) with the United Kingdom during the winter months. However, unlike the UK, Iceland does not observe Daylight Saving Time, so during the summer, Iceland's time zone is 1 hour behind the UK's.