Hi,   i want to use a gantt chart to build a timeline to display some response time but i have an error in the javascript when i display it     Error: Invalid negative value for <rect> attribute width="-1"      i suppose that this error is because my start and my end for each task are bad but i can't find how to resolve it. the dateformat :   - chartRootElement.Add(new XAttribute("dateFormat", "dd-mm-yyyy hh:mn:ss.fff"));   and the start and the end are with this format:  dd/MM/yyyy HH:mm:ss.fff   is it possible to set the with value always width  > 0 ?     thanks for your help.