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.
BST has a fascinating history .