Macro variables need to be adressed with a leading ampersand: &rundt.
A date value formatted with date9. will result in a string that cannot be used as a number (13DEC2018 is not a numeric literal); see Maxim 28.
Try this code for reference:
%let rundt=%sysfunc(today());
data test;
value = today() -5;
result = &rundt. - value;
format value yymmddd10.;
run;
proc print data=test noobs;
run;
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