Assuming the fin yr is just the current year plus 1:
%let start_date = "01Jul2018:00:00:00"DT;
%let start_date_text = %sysfunc(datepart(&start_date),ddmmyyn8.);
%put &=start_date_text;
%let fin_yr=%sysfunc(datepart(&start_date),year2.)%eval(%sysfunc(datepart(&start_date),year2.) + 1);
%put &=fin_yr;
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