[amibroker] MTMACD and time band

[L V Gandhi]

I got the following code from Thomasz article on MTF.
Count = 0;
result = 0;
for( i = 10; i <= 300; i++ )
{
   TimeFrameSet( i * in1Minute );
   m = MACD(12, 26 );
   TimeFrameRestore();
   m = IIf( TimeFrameExpand( m, i * in1Minute ) > 0, 1, -1 );
   result = result + m;
   Count++;
}
AddToComposite( result / Count, "~MACD"+Name(), "X" );
Buy=1;
x = Foreign("~MACD"+Name(),"C");
Plot( x, "MTMACD", colorBlue , styleThick ) ;
PlotGrid(0.5 );
PlotGrid(-0.5);

I want to use it for plotting only for a month from the last trading day
instead of all data. Though I know functions BeginValue and EndValue are
there. I am not sure of how to use it? Can some point me modifying this in
that direction, please.