![]() In a satirical letter to the editor of the Journal de Paris in 1784, Benjamin Franklin suggested that if Parisians could only wake up earlier in the summer they would economize on candle and oil usage, but he did not propose changing the clocks. However, these were changes to the time divisions of the day rather than setting the whole clock forward. ![]() ![]() Historically, several ancient societies adopted seasonal changes to their timekeeping to make better use of daylight Roman timekeeping even included changes to water clocks to accommodate this. Some countries observe it only in some regions for example: it is observed only by some Australian states depending on latitude and by all states in the United States except for Hawaii and Arizona (within the latter, however, the Navajo Nation does observe it, conforming to federal practice). Consequently, only a minority of the world's population uses DST. The typical implementation of DST is to set clocks forward by one hour in spring or late winter, and to set clocks back by one hour to standard time in the autumn (or fall in North American English, hence the mnemonic: "spring forward and fall back").ĭST is not usually observed near the Equator, where sunrise and sunset times do not vary enough to justify it conversely, it is often not observed in places at high latitudes where a one-hour clock shift would provide little benefit because of the wide variations in sunrise and sunset times. ![]() 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 make better use of the longer daylight available during summer, so that darkness falls at a later clock time. ![]()
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