Updated NIBCBank PDF Extractor to support parsing of dividend ex-date

Issue: #5439

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: buchen

name.abuchen.portfolio.tests/src/name/abuchen/portfolio/datatransfer/pdf/nibcbank/NIBCBankPDFExtractorTest.java

@@ -170,6 +170,7 @@ public void testDividende01WithSecurityinEUR()
         assertThat(transaction.getType(), is(AccountTransaction.Type.DIVIDENDS));
 
         assertThat(transaction.getDateTime(), is(LocalDateTime.parse("2019-12-31T00:00")));
+        assertThat(transaction.getExDate(), is(LocalDateTime.parse("2019-12-12T00:00")));
         assertThat(transaction.getShares(), is(Values.Share.factorize(100)));
         assertThat(transaction.getSource(), is("Dividende01.txt"));
         assertNull(transaction.getNote());

name.abuchen.portfolio/src/name/abuchen/portfolio/datatransfer/pdf/NIBCBankPDFExtractor.java

@@ -160,6 +160,11 @@ private void addDividendeTransaction()
                 .match("^Den Betrag buchen wir mit Wertstellung (?<date>[\\d]{2}\\.[\\d]{2}\\.[\\d]{4}) .*$")
                 .assign((t, v) -> t.setDateTime(asDate(v.get("date"))))
 
+                // Ex-Tag 12.12.2019 fonds) 0,208116300 USD
+                .section("exDate").optional()
+                .match("^Ex\\-Tag (?<exDate>[\\d]{2}\\.[\\d]{2}\\.[\\d]{4}).*$")
+                .assign((t, v) -> t.setExDate(asDate(v.get("exDate"))))
+
                 // Ausmachender Betrag 24,03+ EUR
                 .section("amount", "currency")
                 .match("^Ausmachender Betrag (?<amount>[\\.,\\d]+)\\+ (?<currency>[\\w]{3})$")