Function  Betwindate(Byval d1 As Integer , Byval  m1 As Integer , Byval y1 As Integer , Byval d2 As Integer , Byval m2 As Integer, Byval y2 As Integer ) As Long  
    Dim Result As Long
    Dim n1 As Long
    Dim n2 As Long
    
    If m1>2 Then
        m1 = m1+1
    Else
        m1 = m1+13
        y1 = y1-1
    End If
    n1 = 36525*y1\100+306*m1\10+d1
    If m2>2 Then
        m2 = m2+1
    Else
        m2 = m2+13
        y2 = y2-1
    End If
    n2 = 36525*y2\100+306*m2\10+d2
    Result = n2-n1
    
    Betwindate= Result
    
    
End Function

DateTimeDif=cdate(cdbl(DateTimeEnd)-cdbl(DateTimeBegin))