DailyOpen - Question

//*
//* my_DailyOpen_indicator
//*
//* Revision 1.1  2005/11/13 Midnite
//* Initial DailyOpen indicator
//* based pm  
//*
#property copyright "Midnite"
#property link      "[email protected]"
 
#property indicator_chart_window
#property indicator_buffers 1
#property indicator_color1 White
#property indicator_style1 2
#property indicator_width1 1
 
double TodayOpenBuffer[];
extern int TimeZoneOfData= 0;
//+------------------------------------------------------------------+
//| Custom indicator initialization function                         |
//+------------------------------------------------------------------+
int init()
{
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= TimeZoneOfData * 3600;
   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);
}

//+------------------------------------------------------------------+
//|                                          DailyOpenTimeOffset.mq4 |
//|                                                      nicholishen |
//|                                   www.reddit.com/u/nicholishenFX |
//+------------------------------------------------------------------+
#property copyright "nicholishen"
#property link      "www.reddit.com/u/nicholishenFX"
#property version   "1.00"
#property strict
#property script_show_inputs
input int offset = 0;//Hour offset
//+------------------------------------------------------------------+
//| Script program start function                                    |
//+------------------------------------------------------------------+
void OnStart()
{
//---
   double day_open = iOpen(Symbol(),
                           PERIOD_H1,
                           iBarShift(Symbol(),
                                     PERIOD_H1,
                                     iTime(Symbol(),
                                           PERIOD_D1,
                                           0)
                                     +(offset*3600)
                                     )
                           );
}
//+------------------------------------------------------------------+