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This article is about the concept of daylight saving time. Daylight Saving”, “DST”, and “Summer time” redirect here. Europe, most of North America, parts of southern South America and southeastern Australia, and a few other places use DST. Most of equatorial Africa and a few other places near the equator have never used DST.

The rest of the landmass is marked as formerly using DST. Typically, regions that use daylight saving time adjust clocks forward one hour close to the start of spring and adjust them backward in the autumn to standard time. DST is generally not observed near the equator, where sunrise times do not vary enough to justify it. Only a minority of the world’s population uses DST, because Asia and Africa generally do not observe it. Computer software often adjusts clocks automatically, but policy changes by various jurisdictions of DST dates and timings may be confusing.

North and south of the tropics daylight lasts longer in summer and shorter in winter, with the effect becoming greater the further one moves away from the tropics. However, they will have one fewer hour of daylight at the start of each day, making the policy less practical during winter. DST is also of little use for locations near the equator, because these regions see only a small variation in daylight in the course of the year. DST than locations farther west in the same time zone. A small human figurine holds a pointer to a cylinder marked by the hours. The cylinder is connected by gears to a water wheel driven by water that also floats, a part that supports the figurine.

Although they did not fix their schedules to the clock in the modern sense, ancient civilizations adjusted daily schedules to the sun more flexibly than DST does, often dividing daylight into twelve hours regardless of daytime, so that each daylight hour was longer during summer. 06:58 and lasted 75 minutes. Parisians economize on candles by rising earlier to use morning sunlight. 18th-century Europe did not even keep precise schedules. However, this soon changed as rail transport and communication networks came to require a standardization of time unknown in Franklin’s day. Fuzzy head-and-shoulders photo of a 40-year-old man in a cloth cap and mustache. DST in 1905 during a pre-breakfast ride, when he observed with dismay how many Londoners slept through a large part of a summer day.