Add New Slot - Possible to add dates in the past

[mormond]

It's possible to add slots for dates in the past (and also for dates in the very far future). This should probably be prevented or at least pop a warning.

[WillEastbury]

The ability to add dates in the past is correct, sometimes someone will forget to add a time until after it has passed, I would agree with the case for a warning to make sure you are aware of this.

This should just be a case of binding a control to an expression on the viewmodel.

[WillEastbury]

Added the expression to bind to.

[WillEastbury]

pulled it temporarily again