(GMT) Greenwich Mean Time

Greenwich Mean Time (GMT) is a time standard that is often used as a reference time, as it represents the mean solar time at the Royal Observatory in Greenwich, London. It was once used as the basis for the world's time zones, but has since been largely replaced by Coordinated Universal Time (UTC). GMT is still sometimes used to refer to UTC, especially in the United Kingdom and its territories, where it is considered equivalent to UTC. However, it is important to note that GMT is not a time zone, as it does not observe daylight saving time or other seasonal adjustments.