instance method read_date_parameter_value

# File activerecord/lib/active_record/base.rb, line 2070
      def read_date_parameter_value(name, values_hash_from_param)
        set_values = (1..3).collect{|position| values_hash_from_param[position].blank? ? 1 : values_hash_from_param[position]}
        begin
          Date.new(*set_values)
        rescue ArgumentError # if Date.new raises an exception on an invalid date
          instantiate_time_object(name, set_values).to_date # we instantiate Time object and convert it back to a date thus using Time's logic in handling invalid dates
        end
      end