code: public void setDateHeader (@Nonnull @Nonempty final String sName, @Nonnull final LocalDate aLD)
    {
      setDateHeader (sName, PDTFactory.createZonedDateTime (aLD));
    }
docs: Set the passed header as a date header.
  
  @param sName
  Header name. May neither be <code>null</code> nor empty.
  @param aLD
  The LocalDate to set as a date. The time is set to start of day. May
  not be <code>null</code>.