I am trying to create a list validation rule that works for more than 1 argument. I have 2 dates as input, DATE1 AND DATE2, and a third date which is used to check that the first 2 have not expired, DATE3. I can get this to work for one condition using =[DATE1]>[DATE3] but I can't seem to find the syntax for multiple conditions.
You should use =AND(Expr1,Expr2)
=AND(DATE1>DATE3,DATE2>DATE3)
PS: Depending on localization, the separator could be ;
not ,