code: public Date getStart()
     {
        Date result = null;
        for (ResourceAssignment assignment : m_assignments)
        {
           if (result == null || DateHelper.compare(result, assignment.getStart()) > 0)
           {
              result = assignment.getStart();
           }
        }
        return (result);
     }
docs: Retrieves the earliest start date for all assigned tasks.
  
  @return start date