# File lib/mongo_mapper/extensions/time.rb, line 7
      def to_mongo(value)
        if !value || '' == value
          nil
        else
          time_class = ::Time.zone || ::Time
          time = value.is_a?(::Time) ? value : time_class.parse(value.to_s)
          at(time.to_i, time.usec / 1000 * 1000).utc
        end
      end