Thanks for your help but I have already solve the problem. :D
I need to insert the date according to the computer's regional settings.
Dim dd As Integer = System.Convert.ToInt32(stringdate.Substring(0, 2))
Dim mm As Integer = System.Convert.ToInt32(stringdate.Substring(3, 2))
Dim yyyy As Integer = System.Convert.ToInt32(stringdate.Substring(6, 4))
Dim dt As DateTime = New DateTime(yyyy, mm, dd)
dt = FormatDateTime(dt, DateFormat.LongDate)
This website provide me the information.
http://msdn.microsoft.com/library/de...atdatetime.asp