Restricted Date Field

[#1]

I would like to be able to restrict the date entry by the user based on today's date. I want the valid field range to be >$$today + 30days. As an example.

For example - like airlines have black out or grayed out dates that are not active and can not be selected. I want to restrict the user to a 30 day window. So whatever day they enter - they must select a date > 30 days any sooner, it won't allow.

In our development process we have a particular phase that is a 4 week phase, however, 1 week or 2 week dates are selected - thus if the functionality existed I would restrict that field to be 4 weeks or greater but not less than 4 weeks.

[#2]

We use a campaign start and end date on a custom form and need the ability to validate the values to prevent dates in the past or contradictory values from being entered. It would be super if we could validate to only be able to select dates in the future or that a end date is after a start date much like some of the sytem fields in Workfront!