Userform Selected Date Is Transposing Month And Day When Writing To Cell

I've created a User Form to input data on a dashboard where you can select a date from a dynamic list of dates. The list of dates is calculated using:

Code:
=(TODAY())-WEEKDAY((TODAY()),1)+2
The other dates are based on this date -7.

The User Form code:

Code:
Private Sub CommandButton1_Click()
Dim emptyRow As Long
'Make Sheet30 Active

[Code]....

This works perfectly for any date except dates from December. 3/12/12 (3rd Dec) turns to 12/3/12 (12th Mar) when it's copied to the cell. The same happens for 10/12/12 - becomes 12th October instead of 10th December.