Update dlgpreflibrary.cpp

Co-authored-by: ronso0 <ronso0@mixxx.org>

Author: xARSENICx

src/preferences/dialog/dlgpreflibrary.cpp

@@ -840,13 +840,7 @@ void DlgPrefLibrary::slotDateFormatChanged(const QString& text) {
     }
 
     // Update Preview
-    QDate exampleDate = QDate::currentDate();
-    QString previewStr;
-    if (format.isEmpty()) {
-        previewStr = QLocale().toString(exampleDate, QLocale::ShortFormat);
-    } else {
-        previewStr = exampleDate.toString(format);
-    }
+    const QString previewStr = mixxx::formatDate(QDate::currentDate(), format);
     label_dateFormatPreview->setText(previewStr);
 
     m_pConfig->setValue(kDateFormatConfigKey, format);