need help for simple command

#1
how can i plot shape for last day of the week ?

example:
PlotShapes( IIf( DayOfWeek() == 5 , shapeUpArrow , shapeNone ), colorGreen,0,0,0 );

this commad plot only on friday, BUT if friday is holiday, i want the command plot on thursday,

the point plot the last day of the week (but not holiday) :confused:
 

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