Editing Time zone (section)

== Daylight saving time ==
{{Main|Daylight saving time}}
[[File:DaylightSaving-World-Subdivisions.png|thumb|upright=1.35| {{legend|#1b80e6|DST observed}} {{legend|#ef690a|DST formerly observed}}
{{legend|#c00000|DST never observed}}]]

Many countries, and sometimes just certain regions of countries, adopt daylight saving time (DST), also known as summer time, during part of the year. This typically involves advancing [[clock]]s by an [[hour]] near the start of [[spring (season)|spring]] and adjusting back in [[autumn]] ("spring forward", "fall back"). Modern DST was first proposed in 1907 and was in widespread use in 1916 as a [[World War I|wartime]] measure aimed at [[Energy conservation|conserving coal]]. Despite [[Daylight saving time#Dispute over benefits and drawbacks|controversy]], many countries have used it off and on since then; [[Daylight saving time by country|details vary by location]] and change occasionally. Countries around the equator usually do not observe daylight saving time, since the seasonal difference in sunlight there is minimal.