Add datetime msecs property to datefieldbackend

Signed-off-by: Claudio Cambra <claudio.cambra@nextcloud.com>

src/gui/filedetails/datefieldbackend.cpp

@@ -33,5 +33,21 @@ void DateFieldBackend::setDateTime(const QDateTime &dateTime)
     m_dateTime = dateTime;
     Q_EMIT dateTimeChanged();
 }
+
+qint64 DateFieldBackend::dateTimeMsecs() const
+{
+    return m_dateTime.toMSecsSinceEpoch();
+}
+
+void DateFieldBackend::setDateTimeMsecs(const qint64 dateTimeMsecs)
+{
+    if (m_dateTime.toMSecsSinceEpoch() == dateTimeMsecs) {
+        return;
+    }
+
+    const auto dt = QDateTime::fromMSecsSinceEpoch(dateTimeMsecs);
+    setDateTime(dt);
+}
+
 }
 }

src/gui/filedetails/datefieldbackend.h

@@ -27,14 +27,17 @@ class DateFieldBackend : public QObject
     Q_OBJECT
 
     Q_PROPERTY(QDateTime dateTime READ dateTime WRITE setDateTime NOTIFY dateTimeChanged)
+    Q_PROPERTY(qint64 dateTimeMsecs READ dateTimeMsecs WRITE setDateTimeMsecs NOTIFY dateTimeChanged)
 
 public:
     explicit DateFieldBackend() = default;
 
     [[nodiscard]] QDateTime dateTime() const;
+    [[nodiscard]] qint64 dateTimeMsecs() const;
 
 public slots:
     void setDateTime(const QDateTime &dateTime);
+    void setDateTimeMsecs(const qint64 dateTimeMsecs);
 
 signals:
     void dateTimeChanged();