Can someone else please try this with a DateTime box; if it is a real bug, I'll log it formally.
DateTimeBox.Value = CDate("01/01/2019")
Returns an error even though both are date Types.Error returned is : "Type mismatch: Wanted Date , got string instead."
Gambas=3.12.90
OperatingSystem=Linux
Kernel=4.15.0-46-generic
Architecture=x86_64
Distribution=Ubuntu 18.04.2 LTS
Desktop=UBUNTU:GNOME
Theme=Gtk
Language=en_AU.UTF-8