Combining 2 columns into one without losing its format

Try with VBA code. Click the button "COMBINE" to run

PHP Code: 

Option Explicit
Sub test()
Dim cell As Range
Range("D2:D100000").ClearContents
For Each cell In Range("B2:B" & Cells(Rows.Count, "A").End(xlUp).Row)
    With cell.Offset(, 2)
        If Len(cell) = 0 Then
            .Value = cell.Offset(, 1).Value
            .NumberFormat = "0"
        Else
            .Value = cell.Value
            .NumberFormat = "dd/mm/yyyy"
        End If
    End With
Next
End Sub 


If you don't mind the result become text.
Please try

=IF(B2="",TEXT(C2,"0"),TEXT(B2,"dd/mm/yyyy"))

Note: Original data (B and C) needed.

Regards.

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