You can set any attribute (as long as it is not a boolean) to empty.
How is your if then else statement looking? Setting it empty is also working in this context.
Correction: it is changing correctly; however, is there any way to put a BLANK datetime instead of defaulting a value? Currently I default currentdatetime into my calculated datetime field. Ideally I’d like to leave that datetime field blank. The microflow/variable isn’t letting me set my calculated datetime blank because I’m using an IF-THEN clause and the variable editor requires an ELSE to catch all other situations.