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| ArcObjects namespaces > System > ESRI.ArcGIS.esriSystem > Interfaces > IT > ITimeDuration Interface > ITimeDuration.AddWeeks Method (ArcObjects .NET 10.4 SDK) | 
Adds the input amount of weeks to the time duration.
[Visual Basic .NET] Public Sub AddWeeks ( _ ByVal Value As Double _ )
[C#] public void AddWeeks ( double Value );
[C++]
HRESULT AddWeeks(
  double Value
);
[C++]
Parameters Value [in] Value is a parameter of type double