British Summer Time 2025. British summer time (bst) occurs on the last sunday of march and represents the phenomenon when the clocks go forward in spring by one hour and, in autumn, on the last sunday of october, reverts to greenwich mean time. At 1am on the last sunday in march, clocks 'spring forward' by one hour.
British summer time has a complex history, starting with world war i and undergoing several changes before evolving into its current form. This change marks the start of lighter evenings, which many.
