# File lib/active_support/core_ext/time/calculations.rb, line 85
        def change(options)
          ::Time.send(
            self.utc? ? :utc_time : :local_time,
            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[:usec]  || ((options[:hour] || options[:min] || options[:sec]) ? 0 : self.usec)
          )
        end