What is the difference between GMT and UTC?
GMT is often used interchangeably with UTCbut technically GMT refers to the mean solar time at the Royal Observatory in GreenwichLondonwhile UTC is a more precise standard used globally.
UTC time
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GMT
Greenwich Mean Time
11 Feb 2026
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Frequently Asked Questions
Does this area observe DST?
Nothe zone does not observe daylight saving time. Howeverthe United Kingdom switches to BST (British Summer Time) in the summer.
Which major cities follow this pattern?
LondonAccraand Lisbon follow GMT during the winter monthsbefore switching to daylight saving schedules in the summer.
What areas share the same hours?
West African countriesincluding Ghana and Côte d'Ivoirefollow the same schedule as GMT year-round.
How does this compare with UTC?
GMT and UTC are effectively the same in terms of hoursbut GMT is based on astronomical observationswhile UTC is based on atomic time.
Why doesn't this area observe DST year-round?
The zone does not observe daylight saving time because the schedule is based on astronomical principlesand many regions that use GMT do not need to adjust for seasonal changes.
How did this system get established?
GMT was established in the 19th century as the standard for coordinating time worldwidebased on the position of the sun at the Royal Observatory in Greenwich.
What are the typical work hours here?
In places using GMTtypical work hours are 9:00 AM to 5:00 PMaligning with the standard business schedule in many countries.
What is the economic importance of this area?
Greenwichin the United Kingdomis significant as the location of the Royal Observatorythe Prime Meridianand a hub for maritime navigation and global timekeeping.