The only behaviour I get when I click on a date formatted column in detail view is the pop-up of a calendar to choose a date. I have no option to clear the cell and have it blank. The only way I can do that is if I go to table view, find my row, find the date column, select it and press delete/backspace.
I wish I could choose “Blank” in the same way I can with Select columns. (At least in detail view when I use it as a data entry form.)