@Override
    protected void startDocument(PDDocument pdf) throws IOException {
        try {
            xhtml.startDocument();
            try {
                handleDestinationOrAction(pdf.getDocumentCatalog().getOpenAction(),
                        ActionTrigger.DOCUMENT_OPEN);
            } catch (IOException e) {
                //See PDFBOX-3773
                //swallow -- no need to report this
            }
        } catch (TikaException | SAXException e) {
            throw new IOException("Unable to start a document", e);
        }
    }
Format used for signature dates
TODO Make this thread-safe
tika-parsers/tika-parsers-standard/tika-parsers-standard-modules/tika-parser-pdf-module/src/main/java/org/apache/tika/parser/pdf/AbstractPDF2XHTML.java