Daylight saving time (DST)—also summer time in several countries in British English, and European official terminology (see Terminology)—is the practice of advancing clocks so that evenings have more daylight and mornings have less. Typically clocks are adjusted forward one hour near the start of spring and are adjusted backward in autumn.
Though mentioned by Benjamin Franklin in 1784, the modern idea of daylight saving was first proposed in 1895 by George Vernon Hudson and it was first implemented during the First World War. Many countries have used it at various times since then.
The practice has been both praised and criticized. Adding daylight to evenings benefits retailing, sports, and other activities that exploit sunlight after working hours, but can cause problems for evening entertainment and other occupations tied to the sun. Although an early goal of DST was to reduce evening usage of incandescent lighting (formerly a primary use of electricity), modern heating and cooling usage patterns differ greatly, and research about how DST currently affects energy use is limited or contradictory.
DST clock shifts present other challenges. They complicate timekeeping, and can disrupt meetings, travel, billing, recordkeeping, medical devices, heavy equipment, and sleep patterns. Software can often adjust computer clocks automatically, but this can be limited and error-prone, particularly when DST protocols are changed.
Read more about Daylight Saving Time: Justification and Rationale, History, Procedure, Politics, Dispute Over Benefits and Drawbacks, Terminology, Computing, Permanent Daylight Saving Time
Famous quotes containing the words daylight, saving and/or time:
“I thought of rhyme alone,
For rhyme can beat a measure out of trouble
And make the daylight sweet once more....”
—William Butler Yeats (1865–1939)
“We black women must forgive black men for not protecting us against slavery, racism, white men, our confusion, their doubts. And black men must forgive black women for our own sometimes dubious choices, divided loyalties, and lack of belief in their possibilities. Only when our sons and our daughters know that forgiveness is real, existent, and that those who love them practice it, can they form bonds as men and women that really can save and change our community.”
—Marita Golden, educator, author. Saving Our Sons, p. 188, Doubleday (1995)
“The first time many women hold their tiny babies, they are apt to feel as clumsy and incompetent as any man. The difference is that our culture tells them they’re not supposed to feel that way. Our culture assumes that they will quickly learn how to be a mother, and that assumption rubs off on most women—so they learn.”
—Pamela Patrick Novotny (20th century)