Year in Start Date is displayed as 0001

I'm making a workflow to add months to a date. Here is the expression:

DATEADD("mm", DW_INITIAL_TERM_IN_MONTHS, GV_APPRO_DATE)

This shouldn't affect much right now, but there it is anyway, the problem is when I test the workflow and put the date in (30/04/2021), the date is displayed as 30/04/0001
It is a Date field, not a datetime if that's worth anything

Alright, I've done some testing, and that expression doesn't have any effect on the year being displayed wrong. I deleted the step in the workflow so now I only have Start, Assign Start Date and End. It still displays it wrong. Also, the date is now displays the whatever day I entered +1 but the month and year are 01 and 0001 respectively