Get value from iBarShift().

Hello, 

How do you get a value from iBarShift() function for a timeframe other than the current at the start of the terminal (that is the first run)? It is always returning -1(or no bar) no matter what I have tried. I am creating a Multi-time Frame indicator that loops from the start date to the present, analyzing for the said pattern.

datetime startdate = D'2022.01.01';                              // Start Date
ENUM_TIMEFRAME timeframe1 = PERIOD_D1;

m_startday1 = iBarShift(_Symbol, timeframe1, startdate);         
// return -1 (when the chart is in a different TF (e.g 4H) from timeframe1(D1) at the start of the terminal)

        

if the iBarShift() is called for the current timeframe, you get a value.

int CurrentTFBar = iBarShift(_Symbol, _Period, startdate);

meaning, the user would have to change chart, or something that would re-initialize the chart for the indicator buffers to be plotted. Thanks.

Note: I wrote a test program, outputting the values of iBarShift() inside the onCalculate() function for both the current timeframe and a TF different from the current.

***

Test Code:

#property copyright ""
#property link      ""
#property version   "1.00"
#property indicator_chart_window

datetime startday = D'2022.01.04';           // current start date
ENUM_TIMEFRAMES timeframe1 = PERIOD_D1;
//+------------------------------------------------------------------+
//| Custom indicator initialization function                         |
//+------------------------------------------------------------------+
int OnInit()
  {
//--- indicator buffers mapping
   
//---
   return(INIT_SUCCEEDED);
  }
//+------------------------------------------------------------------+
//| Custom indicator iteration function                              |
//+------------------------------------------------------------------+
int OnCalculate(const int rates_total,
                const int prev_calculated,
                const datetime &time[],
                const double &open[],
                const double &high[],
                const double &low[],
                const double &close[],
                const long &tick_volume[],
                const long &volume[],
                const int &spread[])
  {
//--- Print the Current and Inputted TF
      Print("Filename: "__FILE__, " Function: ",__FUNCTION__);
      int CTF = iBarShift(_Symbol, _Period, startday);
      Print(__LINE__, " TimeFrame: ", EnumToString(_Period), " index: ", CTF);
      
      int tf = iBarShift(_Symbol, timeframe1, startday);
      Print(__LINE__, " TimeFrame: ", EnumToString(timeframe1)," index: ", tf);
//--- return value of prev_calculated for next call
   return(rates_total);
  }