double summer time

noun

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.

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Meanings

noundouble summer time (uncountable)
  1. historicaluncountableThe 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
Cite this entry
APA

double summer time. (n.d.). In WatkinsX Dictionary. Retrieved November 4, 2026, from https://dictionary.watkinsx.com/word/double%20summer%20time

MLA

“double summer time.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/double%20summer%20time. Accessed November 4, 2026.

Chicago

WatkinsX Dictionary, s.v. “double summer time,” accessed November 4, 2026, https://dictionary.watkinsx.com/word/double%20summer%20time.

Source: double summer time on Wiktionary, CC BY-SA 4.0.