NL CoronaCheck certificates specify no birth year, show that correctly

src/app/HealthCertificateRecovery.qml

@@ -34,7 +34,7 @@ ColumnLayout {
             Kirigami.FormData.label: i18n("Name:")
         }
         QQC2.Label {
-            text: certificate.dateOfBirth.toLocaleDateString(Qt.locale(), Locale.ShortFormat)
+            text: Localizer.formatDate(certificate, "dateOfBirth")
             visible: !isNaN(certificate.dateOfBirth.getTime())
             Kirigami.FormData.label: i18n("Date of birth:")
         }

src/app/HealthCertificateTest.qml

@@ -34,7 +34,7 @@ ColumnLayout {
             Kirigami.FormData.label: i18n("Name:")
         }
         QQC2.Label {
-            text: certificate.dateOfBirth.toLocaleDateString(Qt.locale(), Locale.ShortFormat)
+            text: Localizer.formatDate(certificate, "dateOfBirth")
             visible: !isNaN(certificate.dateOfBirth.getTime())
             Kirigami.FormData.label: i18n("Date of birth:")
         }

src/app/HealthCertificateVaccination.qml

@@ -37,7 +37,7 @@ ColumnLayout {
             Kirigami.FormData.label: i18n("Name:")
         }
         QQC2.Label {
-            text: certificate.dateOfBirth.toLocaleDateString(Qt.locale(), Locale.ShortFormat)
+            text: Localizer.formatDate(certificate, "dateOfBirth")
             visible: !isNaN(certificate.dateOfBirth.getTime())
             Kirigami.FormData.label: i18n("Date of birth:")
         }

src/app/localizer.cpp

@@ -134,6 +134,19 @@ QString Localizer::formatTime(const QVariant &obj, const QString &propertyName)
     return s;
 }
 
+QString Localizer::formatDate(const QVariant &obj, const QString &propertyName) const
+{
+    const auto dt = JsonLdDocument::readProperty(obj, propertyName.toUtf8().constData()).toDate();
+    if (!dt.isValid()) {
+        return {};
+    }
+
+    if (dt.year() <= 1900) { // no year specified
+        return dt.toString(QStringLiteral("dd MMMM")); // TODO i18n in master
+    }
+    return QLocale().toString(dt, QLocale::ShortFormat);
+}
+
 QString Localizer::formatDateTime(const QVariant& obj, const QString& propertyName) const
 {
     const auto dt = JsonLdDocument::readProperty(obj, propertyName.toUtf8().constData()).toDateTime();

src/app/localizer.h

@@ -26,6 +26,7 @@ public:
     Q_INVOKABLE QString countryFlag(const QString &isoCode) const;
     Q_INVOKABLE QString formatAddress(const QVariant &obj) const;
     Q_INVOKABLE QString formatTime(const QVariant &obj, const QString &propertyName) const;
+    Q_INVOKABLE QString formatDate(const QVariant &obj, const QString &propertyName) const;
     Q_INVOKABLE QString formatDateTime(const QVariant &obj, const QString &propertyName) const;
     Q_INVOKABLE QString formatDuration(int seconds) const;
     Q_INVOKABLE QString formatDistance(int meter) const;