Day Light Saving Time

Daylight saving time (DST) or summer time is the practice of advancing clocks during summer months by one hour so that evening daylight lasts an hour longer, while sacrificing normal sunrise times. Typically, regions with summer time adjust clocks forward one hour close to the start of spring and adjust them backward in the autumn to standard time.
Most of the United States begins Daylight Saving Time at 2:00 a.m. on the second Sunday in March and reverts to standard time on the first Sunday in November. In the U.S., each time zone switches at a different time.
In the European Union, Summer Time begins and ends at 1:00 a.m. Universal Time (Greenwich Mean Time). It begins the last Sunday in March and ends the last Sunday in October. In the EU, all time zones change at the same moment.
Introduced for the first time in 1918 during World War I for just one summer, Daylight Saving Time was used only intermittently and only in some states until World War II, when it was reintroduced nationwide and year-round as “War Time”. The practice lasted from 1942 to 1945, but was followed by patchwork local use again afterwards. A federal law on DST was enacted in 1966, and it has been in use in various permutations and with a number of adjustments ever since.

Many people have difficulties remembering which way the clock moves when the time changes. One easy way is to remember the mnemonic “spring forward, fall back“.

Note that the spelling “daylight savings time” (with an “s” at the end of “savings”) is considered to be incorrect, even though it is more commonly used, especially colloquially. The correct spelling is “daylight saving time” as the term refers to the ‘saving’ of daylight in the morning, to be used in the evening. There is no connection with the word “savings” as used in “savings accounts” or “savings bonds”, which refers to money deposits held in bank accounts.

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