d - other â date or rational
Instance Public methods
Returns the difference between the two dates if the other is a date object.
If the other is a numeric value, returns a date object pointing other days
before self. If the other is flonum, assumes its precision is at most
nanosecond.
Date.new(2001,2,3) - 1 #=> #<Date: 2001-02-02 ...>
DateTime.new(2001,2,3) - Rational(1,2)
#=> #<DateTime: 2001-02-02T12:00:00+00:00 ...>
Date.new(2001,