Forms :: Date From One Form To Another

I have a form (frmHourEnter) with textbox (Week_Ending) to select a date, and a command button (cmdStaffReport) to open another form (frmStaffReport) with textbox (txtDate). The Week_Ending is not related to any table, it is just a date on a form.The first form code is:

Code:
Public sDate As Date
Private Sub Week_Ending_Exit(Cancel As Integer)
sDate = Week_Ending.Value
End Sub

The second form (frmStaffReport) code is:

Code:
Private Sub Form_Load()
txtDate.Value = frmHourEnter.sDate.Value
End Sub

On opening this form I get Variable not defined relating to frmHourEnter portion of frmHourEnter.sDate.Value.