Dictionary

double summer time en · NOUN

Meanings

1. (historical, uncountable) The advancing of clocks by two hours ahead of winter time in the summer instead of the usual one hour; mainly used during World War II in the United Kingdom.
   • Double summertime in Ireland had some curious effects on timetables, seeing that in Eire the single additional hour only was worked to, whereas in Northern Ireland the full British two-hour addition was in operation. 1941 September, “Notes and News: Timetable Puzzles in Ireland”, in Railway Magazine, page 428:

Hyponyms

British Double Summer Time