Converting US Date To UK Date in Reporting Services

I am using thise function in the Code Properties of my Report to convert US Date formats to UK Date format :

Public Function ConvertUSDateToUKDate(ByVal strUSDate As Object) As String
Dim strDay As String = strUSDate.Substring(3, 2)
Dim strMonth As String = strUSDate.Substring(0, 2)
Dim strYear As String = strUSDate.Substring(6, 4)
Dim strUKDate As String = strDay + "/" + strMonth + "/" + strYear + strUSDate.Substring(10, 12)
Return strUKDate
End Function

I keep getting an error with it, I'm not sure whether it is a VB.NET code error, or a Reporting Services error. Can anybody help?

Cheers,

Mike

Sorted this out :

Public Function ConvertUSDateToUKDate(ByVal strUSDate As String) As String
Dim strUKDate As String = ""
If Not (strUSDate = "") Then
Dim arrRateArray As String()
Dim arrSeparator As Char() = {"/"C}
arrRateArray = strUSDate.Split(arrSeparator)
Dim strMonth As String = arrRateArray(0)
Dim strDay As String = arrRateArray(1)
Dim strYear As String = arrRateArray(2).Substring(0, 4)
Dim strTime As String = arrRateArray(2).Substring(5, arrRateArray(2).Length - 5)
strUKDate = strDay + "/" + strMonth + "/" + strYear + " " + strTime
Else
strUKDate = ""
End If