page_title: Daylight saving time
hierarchical_section_title: Daylight saving time
caption_attribution_description: English: Larger map of the previous version. Distinguished from summertime in the northern hemisphere and southern hemisphere. &#160;&#160; Northern hemisphere summer &#160;&#160; Southern hemisphere summer &#160;&#160; Formerly used daylight savings &#160;&#160; Never used daylight savings
context_page_description: Daylight saving time, also daylight savings time or daylight time and summer time, is the practice of advancing clocks during warmer months so that darkness falls later each day according to the clock. The typical implementation of DST is to set clocks forward by one hour in the spring and set clocks back by one hour in autumn to return to standard time. In other words, there is one 23-hour day in late winter or early spring and one 25-hour day in the autumn.
  George Hudson proposed the idea of daylight saving in 1895. The German Empire and Austria-Hungary organized the first nationwide implementation starting on April 30, 1916. Many countries have used it at various times since then, particularly since the 1970s energy crisis. DST is generally not observed near the equator, where sunrise and sunset times do not vary enough to justify it. Some countries observe it only in some regions; for example, parts of Australia observe it, while other parts do not. Only a minority of the world's population uses DST; Asia and Africa generally do not observe it.
context_section_description: Daylight saving time (DST), also daylight savings time or daylight time (United States and Canada) and summer time (United Kingdom, European Union, and others), is the practice of advancing clocks during warmer months so that darkness falls later each day according to the clock. The typical implementation of DST is to set clocks forward by one hour in the spring ("spring forward") and set clocks back by one hour in autumn ("fall back") to return to standard time. In other words, there is one 23-hour day in late winter or early spring and one 25-hour day in the autumn.
  George Hudson proposed the idea of daylight saving in 1895. The German Empire and Austria-Hungary organized the first nationwide implementation starting on April 30, 1916. Many countries have used it at various times since then, particularly since the 1970s energy crisis. DST is generally not observed near the equator, where sunrise and sunset times do not vary enough to justify it. Some countries observe it only in some regions; for example, parts of Australia observe it, while other parts do not. Only a minority of the world's population uses DST; Asia and Africa generally do not observe it.
  DST clock shifts sometimes complicate timekeeping and can disrupt travel, billing, record keeping, medical devices, heavy equipment, and sleep patterns. Computer software often adjusts clocks automatically, but policy changes by various jurisdictions of DST dates and timings may be confusing.
caption: Daylight saving time regions:   Northern hemisphere summer   Southern hemisphere summer   Formerly used daylight saving   Never used daylight saving
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