How to specify a specific range of dates

I have a List that tracks certificates. I need to limit two of the input fields and I'm not sure how.

I have a formula (=[Expiration Date]>[Last updated]) in place that prohibits an Expiration Date greater than the Last Updated field. Now I need to prohibit a date greater than Today's, from being put into the Last Update field.

Would I make this in the Validation Settings where I made the initial rule? Or somewhere else?

Thanks