Is it possible to create a DateTime field that has validation?

Is it possible to create a DateTime field that has validation?

I.E.

We need a  DateTime to schedule future events for our staff members.

Currently, the  DateTime fields are all setup and functioning however, They would like the  DateTime to not allow for a day prior to one week in advanced.

Is there a way to not allow or to auto update to 1 week from today for the value of the  DateTime field?

Please, let me know if this is possible.