Now XL2K SP-3.

I'll admit I'm torture testing now.

I select B2:C7 as QDE entry range in an activated worksheet. I select that
entire range, type 1 and press [Ctrl]+[Enter]. All cells contain 1. I have
to select individual cells to get them formatted as dates, but this doesn't
trigger invalid date entry. Also, every cell in this range displays
12/31/1899 when it's the ActiveCell, so there's definitely a bug in the
SelectionChange event handler - even in XL2K.

However, single cell entry in multiple cell selections does work.