code: private Calendar getAccessWindowStart() {
  
          // Get window start time
          Time start = getModel().getAccessWindowStart();
          if (start == null)
              return null;
  
          // Return within defined time zone, current day
          return asCalendar(Calendar.getInstance(getTimeZone()), start);
  
      }
docs: Returns the time during the current day when this user account can start
  being used.
  
  @return
  The time during the current day when this user account can start
  being used.