https://www.youtube.com/watch?v=br0NW9ufUUw

& http://www.lsm.lv/lv/raksts/latvija/zinas/eksperti-pareja-uz-vasaras-laiku-saredz-vairak-prieksrocibu.a123297/

kur rakstīts:
""Ja mēs runājam, kāpēc vispār tāds vasaras laiks sākotnēji ir parādījies un kāpēc mēs uz to pārejam, ir jāsaka, ka vēsturiski šī ideja ir cēlusies no tā, ka ir bijusi vēlme cilvēkiem ietaupīt elektroenerģiju un iegūt vienu stundu gaišā diennakts laika. Šodien tas ir lielākais ieguvums visiem iedzīvotājiem," skaidro Jolanta Reinsone."

Wiki (https://en.wikipedia.org/wiki/Daylight_saving_time):
Starting on 30 April 1916, Germany and its World War I ally Austria-Hungary were the first to use DST (German: Sommerzeit) as a way to conserve coal during wartime. Britain, most of its allies, and many European neutrals soon followed suit. Russia and a few other countries waited until the next year and the United States adopted it in 1918.

Broadly speaking, Daylight Saving Time was abandoned in the years after the war (with some notable exceptions including Canada, the UK, France, and Ireland for example). However, it was brought back for periods of time in many different places during the following decades, and commonly during the Second World War. It became widely adopted, particularly in North America and Europe starting in the 1970s as a result of the 1970s energy crisis.

Piezīme, LV versijā (https://lv.wikipedia.org/wiki/Vasaras_laiks) rakstīts, ka "Pirmo reizi uz vasaras laiku 1908. gadā pārgāja Apvienotajā Karalistē.", EN par Apvienoto Karalsti: "The proposal was taken up by the Liberal Member of Parliament (MP) Robert Pearce, who introduced the first Daylight Saving Bill to the House of Commons on 12 February 1908. A select committee was set up to examine the issue, but Pearce's bill did not become law, and several other bills failed in the following years. Willett lobbied for the proposal in the UK until his death in 1915."

prasās pielabot.