daylight-saving time

or day·light-sav·ings time

[ dey-lahyt-sey-ving ]
/ ˈdeɪˌlaɪtˈseɪ vɪŋ /


the civil time observed when daylight saving is adopted in a country or community.



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Origin of daylight-saving time

First recorded in 1905–10

Words nearby daylight-saving time Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

British Dictionary definitions for daylight-saving time

daylight-saving time


time set usually one hour ahead of the local standard time, widely adopted in the summer to provide extra daylight in the eveningAlso called (in the US): daylight time See also British Summer Time
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Scientific definitions for daylight-saving time

daylight-saving time
[ dā′līt-sāvĭng ]
daylight-savings time

Time during which clocks are set one hour or more ahead of standard time to provide more daylight at the end of the working day during late spring, summer, and early fall. First proposed by Benjamin Franklin, daylight saving time was instituted in various countries during both world wars in the 20th century and was made permanent in most of the United States beginning in 1973. Arizona, Hawaii, most of eastern Indiana, and certain US territories and possessions do not observe daylight saving time.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.