Can I use variables in the 'sql after' tab of MS SQL writer?

Say if I set variable <FileDate> = 2020-02-28, can I then use it in the "SQL After"

UPDATE table1
SET table1.[End_Date]=<FileDate>
from table1 atr
left outer join table2 tmp
on atr.URN = tmp.URN
where tmp.URN is NULL;

That should work.
Remember all variables are strings so put them in quotes when necessary