Simple batch to set a variable 2 years into the future, works out Year, plus 2 and then adds to the date
Credits: SS64
set /a YEARVAR=%DATE:~+8,2%
set /a YEARVAR=%YEARVAR%+2
set YEARVAR=%YEARVAR%
set DATEVAR=%DATE:~0,8%
set "EXP_DATE=%DATEVAR%%YEARVAR%"