British Summer Time is a period in the spring and summer during which the clocks are put forward, so that people can have an extra hour of daylight in the evening. When we put the clocks forward in March we go into British Summer Time. BST the time one hour ahead of Greenwich Mean Time that is used in Britain from late March to late October daylight saving time
the warmest season of the year; in the northern hemisphere it extends from the summer solstice to the autumnal equinox; "they spent a lazy summer at the shore"