* How many days between 2012 March 1 and 2012 March 7?
            2455993.5 - 2455987.5 =  6

    * How many days between 2012 Jan 1 and 2012 March 7?
            2455993.5 - 2455927.5 =  66

    * How many days between 2011 Jan 1 and 2012 March 7?
            2455993.5 - 2455562.5 =  431

    * How many days between 1911 Jan 1 and 2012 March 7?
            2455993.5 - 2419037.5 =  36,956

    * How many days between 1704 Jan 1 and 2012 March 7? 
            2455993.5 - 2343431.5 =  112,562