Could someone change the code of this indicator to extend the line until the next day like a regular horizontal line?

[corem]

#property indicator_chart_window
#property indicator_buffers 1
#property indicator_color1 Blue
#property indicator_style1 0
#property indicator_width1 0


double TodayOpenBuffer[];
extern int Hour_= 0;
extern int Minutes = 0;
//+------------------------------------------------------------------+
//| Custom indicator initialization function                         |
//+------------------------------------------------------------------+
int init()

{
   if (Hour_>23){
   Alert ("Please enter a value lower than 24 hours");
   return(0);}

   if (Minutes>59){
   Alert ("Please enter a value lower than 60 minutes");
   return (0);}
  
        SetIndexStyle(0,DRAW_LINE);
        SetIndexBuffer(0,TodayOpenBuffer);
        SetIndexLabel(0,"Open");
        SetIndexEmptyValue(0,0.0);
        return(0);
}
//+------------------------------------------------------------------+
//| Custor indicator deinitialization function                       |
//+------------------------------------------------------------------+
int deinit()
{
        return(0);
}
//+------------------------------------------------------------------+
//| Custom indicator iteration function                              |
//+------------------------------------------------------------------+
int start()
{
   int lastbar;
   int counted_bars= IndicatorCounted();
   
   if (counted_bars>0) counted_bars--;
   lastbar = Bars-counted_bars; 
   DailyOpen(0,lastbar);
   
   return (0);
}
//+------------------------------------------------------------------+
//|                                                                  |
//+------------------------------------------------------------------+
int DailyOpen(int offset, int lastbar)
{
   int shift;
   int tzdiffsec= (Hour_*3600)+(Minutes*60);
   double barsper30= 1.0*PERIOD_M30/Period();
   bool ShowDailyOpenLevel= True;
   // lastbar+= barsperday+2;  // make sure we catch the daily open              
   lastbar= MathMin(Bars-20*barsper30-1, lastbar);

        for(shift=lastbar;shift>=offset;shift--){
          TodayOpenBuffer[shift]= 0;
     if (ShowDailyOpenLevel){
       if(TimeDay(Time[shift]-tzdiffsec) != TimeDay(Time[shift+1]-tzdiffsec)){      // day change
         TodayOpenBuffer[shift]= Open[shift];         
         TodayOpenBuffer[shift+1]= 0;                                                           // avoid stairs in the line
       }
       else{
         TodayOpenBuffer[shift]= TodayOpenBuffer[shift+1];
       }
          }
   }
   return(0);

[corem]

This indicator draws a horizontal line at a specific chosen hour.  Right now the line only develops with the time.

I would like to see if it is possible to extend the line until the next day.  Thank you.