I want to display the number of orders for today using datetime.

#Get current time
[1] pry(main)> dt=DateTime.now
=> Wed, 23 Dec 2020 05:34:58 +0000

#Process only date information with parse
[2] pry(main)> today=Date.parse(dt.strftime("%Y/%m/%d %H:%M:%S"))
=> Wed, 23 Dec 2020


#Define a date
[3] pry(main)> dt2 = DateTime.new(2020,12,23,5,6,7)     
=> Wed, 23 Dec 2020 05:06:07 +0000

#Process only date information with parse
[4] pry(main)> the_day=Date.parse(dt2.strftime("%Y/%m/%d %H:%M:%S"))
=> Wed, 23 Dec 2020

#today == the_day
[5] pry(main)> the_day == today
=> true

    def top

        dt=DateTime.now  #First, get today's date. Like this(=> Wed, 23 Dec 2020 05:34:58 +0000）
        today=Date.parse(dt.strftime("%Y/%m/%d %H:%M:%S"))  #Extract only the date
        
        
        orders=Order.all  #For the time being, I will pull all the order information.
        
        @sum=0  #For the total number. * Note that it is not initialized separately.
                #@sum = @sum +When set to 1, "@What is sum? I get the error.

        orders.each do |x|   #Since it is a science system, it is defined as x.
            dt2=x.created_at
            the_day=Date.parse(dt2.strftime("%Y/%m/%d %H:%M:%S"))
            
            if today == the_day
                @sum = @sum + 1
            end
            
        end
        
    end

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