# File lib/numru/nusdas.rb, line 143
      def time_from_str(str)
        raise("arugment must be String") unless String === str
        raise("str length must be 12") unless str.length == 12
        year = str[0,4].to_i
        mon = str[4,2].to_i
        day = str[6,2].to_i
        hour = str[8,2].to_i
        min = str[10,2].to_i
        return ( (Date.new(year,mon,day)-@@date0).to_i*24 + hour )*60 + min
      end