Fields with Date type converted to String type

[MikhanGusev]

Have the following workflow:

1. Open NextGIS Connect plugin and add the layer with features from my NGW instance to the current project. Type of the field: QDate
2. Copy all features of the layer to the clipboard.
3. Paste features as New scratch temporary layer. Type of the field: QDate.
4. Add some new fields and set values for them.
5. Add this layer to Web GIS. See this layer in browser - type of the field: STRING.

Initial layer: http://mikhail.nextgis.com/resource/22
Final layer: http://mikhail.nextgis.com/resource/46

[MikhanGusev]

The same thing also with the simple workflow:

1. Create new scratch temporary layer in QGIS with date, time and date-time fields with some data.
2. Add to Web GIS: all these fields converted to string (ddd, ddd2, ddd3).
   http://mikhail.nextgis.com/resource/48