Grandfather clocks are pictured in a clock collection in central France, on March 24, 2015. This year, clocks will spring forward an hour to summer time on March 30, 2015. Daylight saving time was first introduced in 1973 with the oil crisis for the sake of saving energy and is applied today in more than 70 countries. AFP PHOTO / GUILLAUME SOUVANT (Photo by GUILLAUME SOUVANT / AFP) (Photo credit should read GUILLAUME SOUVANT/AFP/Getty Images)
