Daylight saving time (DST)—also summer time in several countries, in British English, and European official terminology (see Terminology)—is the practice of advancing clocks so that evenings have more daylight and mornings have less. Typically clocks are adjusted forward one hour near the start of spring and are adjusted backward in autumn.

Though mentioned by Benjamin Franklin in 1784, the modern idea of daylight saving was first proposed in 1895 by George Vernon Hudson and it was first implemented during the First World War. Many countries have used it at various times since then.

The practice has been both praised and criticized. Adding daylight to evenings benefits retailing, sports, and other activities that exploit sunlight after working hours, but can cause problems for evening entertainment and other occupations tied to the sun. Although an early goal of DST was to reduce evening usage of incandescent lighting, formerly a primary use of electricity, modern heating and cooling usage patterns differ greatly, and research about how DST currently affects energy use is limited or contradictory.

Louis Marshall Jones (October 20, 1913 – February 19, 1998), known professionally as Grandpa Jones, was an American banjo player and "old time" country and gospel music singer. He is a member of the Country Music Hall of Fame.

Born in the farming community of Niagra in Henderson County, Kentucky, Jones spent his teenage years in Akron, Ohio, where he began singing country music tunes on a radio show on WJW. In 1931, Jones joined the Pine Ridge String Band, which provided the musical accompaniment for the very popular Lum and Abner show. By 1935 his pursuit of a musical career took him to WBZ (AM) radio in Boston, Massachusetts where he met musician/songwriter Bradley Kincaid, who gave him the nickname "Grandpa" because of his off-stage grumpiness at early-morning radio shows. Jones liked the name and decided to create a stage persona based around it.