public DateTime GetTimestamp()

QueuedTask.Run(() =>
{
  //Create a connection properties
  var kg_props =
      new KnowledgeGraphConnectionProperties(new Uri(url));
  using (var kg = new KnowledgeGraph(kg_props))
  {
    //Get the KnowledgeGraph Data Model
    using (var kg_dm = kg.GetDataModel())
    {
      var kg_name = System.IO.Path.GetFileName(
               System.IO.Path.GetDirectoryName(kg_props.URL.ToString()));

      System.Diagnostics.Debug.WriteLine(
        $"\r\n'{kg_name}' Datamodel:\r\n-----------------");
      var time_stamp = kg_dm.GetTimestamp();
      var sr = kg_dm.GetSpatialReference();
      System.Diagnostics.Debug.WriteLine($"Timestamp: {time_stamp}");
      System.Diagnostics.Debug.WriteLine($"Sref: {sr.Wkid}");
      System.Diagnostics.Debug.WriteLine(
        $"IsStrict: {kg_dm.GetIsStrict()}");
      System.Diagnostics.Debug.WriteLine(
        $"OIDPropertyName: {kg_dm.GetOIDPropertyName()}");
      System.Diagnostics.Debug.WriteLine(
        $"IsArcGISManaged: {kg_dm.GetIsArcGISManaged()}");
    }
  }
});