date_marshal_compat.rb

require 'date'

class Date
  # Try to read Marshal data of 1.9.3 Date
  # !!CAUTION: COMPLETELY UNTESTED!!!
  if RUBY_VERSION < "1.9.3"
    def marshal_load(ary)
      case ary.size
      when 3
        @ajd, @of, @sg, = ary
      when 6
        nth, jd, df, sf, of, sg, = ary
        @ajd = jd + nth * 71149239
        df -= 86400 / 2
        if df.nonzero?
          @ajd += df.to_r / 86400
        end
        if sf.nonzero?
          @ajd += sf.to_r / (86400 * 1000000000)
        end
        if of.nonzero?
          @of = of.to_r / 86400
        else
          @of = 0
        end
        @sg = sg.to_i
      else
        raise TypeError, "cannot read Date"
      end
      @__ca__ = {}
    end
  end
end