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DST is an abbreviation for daylight-saving time, the period during which the time is adjusted in order to gain an extra hour of daylight in the evening during part of the year.

Daylight-saving time begins in the spring, when clocks are set one hour ahead. They are then set one hour back in the fall. Daylight-saving time is also commonly called daylight-savings time.

The term daylight saving (or daylight savings) refers to the practice of adjusting the time in this way. Both of these terms can be used as short forms of daylight-saving time. All of these terms can also refer to the specific mode of time that’s being used during a particular period, as opposed to standard time.

People often use the simple mnemonic spring forward, fall back to remember to set clocks forward one hour (e.g., from 2 a.m. to 3 a.m.) in the spring and backward one hour (e.g., from 2 a.m. to 1 a.m.) in the fall. This is often seen as resulting in one less hour of sleep time on the day that the clocks are adjusted in the spring and one more hour when they’re changed in the fall.

Daylight-saving time is widespread, but it is not observed everywhere or in the same way in all locations. In the U.S., for example, daylight-saving time is not observed by the states of Arizona or Hawaii.

Example: Don’t forget to set your clocks ahead for DST.

The specific dates on which daylight-saving time begins and ends change from year to year, but they are always scheduled for the early morning hours of a Sunday.

The dates for the beginning and end of daylight-saving time also vary from place to place within a given year.

In the U.S., DST in 2021 will begin on March 14 and end on November 7. In 2022, it will begin on March 13 and end on November 6.

In the U.K., DST in 2021 will begin on March 28 and end on October 31. In 2022, it will begin on March 27 and end on October 30.

The first records of the term daylight-saving time come from the early 1900s. The practice is thought to have been first proposed by U.S. statesman and scientist Benjamin Franklin in the 1700s. The idea gained traction in the late 1800s and was first officially adopted by Germany in 1916, followed soon after by several other countries, including the U.S. in 1918. Daylight-saving time was enacted during this time in part as a way to save energy costs during World War I, and the same thing was done during World War II. An annual period of daylight-saving time was permanently enacted for much of the U.S. in 1973.

Today, the need for daylight-saving time is debated, with critics noting that it no longer serves the practical purposes that it was once intended to.

What are some terms that often get used in discussing DST?

• daylight-saving time
• daylight saving
• standard time
• time
• clock
• daylight
• hour
• spring
• forward
• fall
• back
• change
• observe

DST is not commonly used in speech or in contexts in which daylight-saving time hasn’t already been mentioned.

Daylight Saving Time is the best, if we dump the change I'd dump standard time. Based on the avg. wake-up time of 7:09am & bedtime of 11:39pm for US adults. DST allows people in Charlotte to be awake for every minute of daylight from Apr 2-Sept 18th.

— Brad Panovich (@wxbrad)

It's nearly 7 p.m. and still twilight, and daylight savings time is only two weeks away!! I unapologetically love DST. I have no use for light in the mornings, but I love the long evenings of spring and summer.

— Satine Kryze but not a pacifist (@LindsayKnake)

It’s lovely how long daylight grows naturally throughout the first half of the year, no DST required.

— Jay Pea (@Mr_Jay_Pea)

What does DST stand for?

A. daylight-saving time
B. daylight-standard time
C. daily-sunlight time
D. double-snooze time