Daylight saving time
Seasonal change of clock settings
Daylight saving time
Daylight saving time (DST), also referred to as daylight savings time, daylight time (United States and Canada), or summer time (United Kingdom, European Union, and others), is the practice of advancing clocks to (in theory) make better use of the longer daylight available during summer by having darkness fall at a later clock time. The typical implementation of DST is to adjust clocks ahead of standard time by one hour in spring or late winter, and to set clocks back by one hour in the autumn (or fall in North American English, hence the mnemonic: "spring forward, fall back"). In many countries, the part of the year when DST is observed is much longer than the part aligned to standard time. The practice of DST was first tested and widely adopted in the early 20th century, since when many jurisdictions have introduced DST, while others have abandoned DST partially or entirely. On the other hand, some jurisdictions have switched to daylight savings permanently, avoiding the semi-annual clock...
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