As it is currently not possible to use DateTime type attributes as a database constraint and xpath is not supported offline, it would be handy if it were possible to enable DateTime as a database constraint.
https://community.mendix.com/link/questions/90792 (has images of errors upon trying to do so)
If not, it would at least be nice if it were documented somewhere (or I just didn't find it in the documentation) why this is not possible and why it should not be possible.