Definition: Daylight saving time

From New World Encyclopedia

Alternative forms

  • daylight-saving time
  • daylight savings time
  • daylight saving, daylight savings
  • daylight time


daylight saving time (countable and uncountable, plural daylight saving times)

  1. The practice in some places of adjusting clocks forward in the spring and back in the fall, usually by one hour, so that the adjustment causes the time to coincide with the greatest period of illumination by the sun over the course of the day.

Usage notes

The form daylight-saving time, with a hyphen, is best grammatically; the phrase "daylight-saving" acts as an adjective describing time.

Daylight Saving Time, without the hyphen, is the official name in the United States.


  • summer time UK


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