Extension method to check if a Nullable Datetime has value or not. If it has value then return that else return default value using VB.NET?

Public NotInheritable Class ClassExtensions
	Private Sub New()
	End Sub
	<System.Runtime.CompilerServices.Extension> _
	Public Shared Function GetProperDate(dt As System.Nullable(Of DateTime)) As DateTime
		Return If(dt.HasValue, dt.Value, New DateTime(1900, 1, 1))
	End Function
End Class