Hi roYal, 

I Don't think you can do this like that, what can you do to add this to your controller not to model file and show it on cshtml after adding,

// in model
  [Ignore]
  public DateTime DateReminder { get; set; }
 
// in controller
  currentPage.DateReminder = currentPage.DateReminder;

// in cshtml
@{
adding both in variable and show it.
}

thank you

Thank you for answering PuneetGarg.

As I understand it, I have to create a widget if I want to display a property value in edit mode.

Otherwise I have to present the value in the view instead of in the edit mode?

I saw in the settings tab where published date shows as the image below, is it complicated to manage?

Thanks.

I sorted it out.

Created a new Initialization class

[InitializableModule]
    [ModuleDependency(typeof(EPiServer.Web.InitializationModule))]
    public class EventInitialization : IInitializableModule
    {
        public void Initialize(InitializationEngine context)
        {
            ServiceLocator.Current.GetInstance<IContentEvents>().LoadedContent += eventRegistry_LoadedContent;
        }

        public void Uninitialize(InitializationEngine context)
        {
            ServiceLocator.Current.GetInstance<IContentEvents>().LoadedContent -= eventRegistry_LoadedContent;
        }

        void eventRegistry_LoadedContent(object sender, ContentEventArgs e)
        {
            if (e.Content is MyPageData s)
            {
                s = s.CreateWritableClone() as MyPageData;
                s.DateReminder= s.Changed.AddMonths(p.MonthReminder);
                e.Content = s;
            }
        }
    }

 Then add the DateToRemind property in you Model to display the new date.

public virtual DateTime? DateReminder{ get; set; }

Done