default_datetime

# File actionpack/lib/action_view/helpers/date_helper.rb, line 1004
        def default_datetime(options)
          return if options[:include_blank] || options[:prompt]

          case options[:default]
            when nil
              Time.current
            when Date, Time
              options[:default]
            else
              default = options[:default].dup

              # Rename :minute and :second to :min and :sec
              default[:min] ||= default[:minute]
              default[:sec] ||= default[:second]

              time = Time.current

              [:year, :month, :day, :hour, :min, :sec].each do |key|
                default[key] ||= time.send(key)
              end

              Time.utc_time(
                default[:year], default[:month], default[:day],
                default[:hour], default[:min], default[:sec]
              )
          end
        end