need help in codeing of datediff()

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VB

Hi all

i wrote the below code to find the date difference

Dim var As String
        var = ds.Tables(0).Rows(0)(0)
        connection.Close()
        Dim time As DateTime = var
        Dim mth As Integer
        mth = DateDiff(DateInterval.Month, DateTime.Now, time)
        If mth <= 6 Then

but i am getting the "mth" value in negative..please tell me where i am wrong

the value of "time" is 1/8/2012