code: @Nullable
    public static LocalTime getLocalTime (@Nullable final XMLGregorianCalendar aCal)
    {
      if (aCal == null)
        return null;
      return getGregorianCalendar (aCal).toZonedDateTime ().toLocalTime ();
    }
docs: Get the passed {@link XMLGregorianCalendar} as {@link LocalTime}.
  
  @param aCal
  The source {@link XMLGregorianCalendar}. May be <code>null</code>.
  @return <code>null</code> if the parameter is <code>null</code>.