eastein@glamdring:/big/home/eastein$ ddiff "8 mar 2005" "18 may 2007"
2 years, 70 days.
eastein@glamdring:/big/home/eastein$ calc 2*365
        730
eastein@glamdring:/big/home/eastein$ calc 730+70
        800
eastein@glamdring:/big/home/eastein$ calc 19100/800
        23.875