ADD_MONTHS in Calculated Column

Hi everybody,

I want to create a date, which is 36 month before the date I use right now. To add months to a date I found a function called add_months. https://help.sap.com/saphelp_hanaone/helpdata/en/20/da7b237519101489f3e2e1a284355a/content.htm

I created a calculated column, but I cant use the expression within the editor because the function is not supported. Furthermore, I would need a sub_months function.

Any thoughts how to create a date like that in a calculation view?

Regards, Christoph.