#include "dow2012.c"

Enter year (>1970) 2011
13/05/2011 is a Black Friday.

Enter year (>1970) 2012
13/01/2012 is a Black Friday.
13/04/2012 is a Black Friday.
13/07/2012 is a Black Friday.

Enter year (>1970) 2013
13/09/2013 is a Black Friday.
13/12/2013 is a Black Friday.

n = dow(yy,mm,dd);	// 0=sunday, 1=monday, ...