I would like to know what controls the date format in VB.NET. For example, if I have this:

Public Function GetMessage(ByVal tdDate As Date) As String
   Return tdDate
End Function

Is the date format controlled by the OS or within the definition of the Web Service?

In my case, I need to rely on a DD/MM/YYYY format. So here, before returning the date value, I need to pass that date to another process in the DD/MM/YYYY format.