1. Greenwich Mean Time (GMT), which is Coordinated Universal Time (UTC) with no additional offset:
a. This timezone, sometimes referred to as Western European Time (WET), covers England, Wales, Northern Ireland, the Channel Islands, and the Isle of Man. For most of 2023, GMT is equal to UTC as daylight saving time is not in effect between the last Sunday in October and the last Sunday in March when British Summer Time resumes.
2. British Summer Time (BST), which is one hour ahead of GMT (UTC+01:00):
a.BST is generally observed during Daylight Saving Time (DST) between the last Sunday in March (1:00 am GMT / 2:00 BST) and the last Sunday in October (2:00 am BST / 1:00 am GMT) when the clocks turn back to GMT
