double summer time

English

Noun

double summer time (uncountable)

1. The advancing of clocks by two hours ahead of winter time in summer instead of the usual one hour; mainly used during World War II in the United Kingdom.

   Hyponym: British Double Summer Time

   • 1941 September, “Notes and News: Timetable Puzzles in Ireland”, in Railway Magazine, page 428:

     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.

References

• “double summer time”, in Lexico, Dictionary.com; Oxford University Press, 2019–2022.