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What is GMT

Greenwich Mean Time (GMT)

GMT is never adjusted forwards or backwards

Clock time and time zone standard

Time at the Shepherd Gate Clock, at the Royal Observatory in Greenwich, UK. GMT stays the same all year round, no DST (Daylight Saving Time) rules apply.

GMT is not just a specific clock time, but something else too. So, what is GMT?

The rest of clocks in the UK will show the same time as the time at the Royal Observatory clock only when Daylight Saving Time is not in use.

When DST is in use, between March and October, the clocks will be on British Summer Time (BST) , or GMT+1 .

BST has a fascinating history .

The United Kingdom is in the Western European Time Zone .

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