    # File lib/active_support/core_ext/date_time/calculations.rb, line 46
            def change(options)
              ::DateTime.civil(
                options[:year]  || self.year,
                options[:month] || self.month,
                options[:day]   || self.day,
                options[:hour]  || self.hour,
                options[:min]   || (options[:hour] ? 0 : self.min),
                options[:sec]   || ((options[:hour] || options[:min]) ? 0 : self.sec),
                options[:offset]  || self.offset,
                options[:start]  || self.start
              )
            end