Umbraco Default Property Value

using System;
using System.Linq;
using System.Web.Http.Filters;
using Umbraco.Core;
using Umbraco.Core.Composing;
using Umbraco.Core.Logging;
using Umbraco.Web.Editors;
using Umbraco.Web.Models.ContentEditing;
//If using Models Builder generated models from the default namespace
using Umbraco.Web.PublishedModels;

public class EditorModelComponent : IComponent
{
    private readonly ILogger logService;

    public EditorModelComponent(ILogger logService) {
        this.logService = logService;
    }

    public void Initialize() {
        EditorModelEventManager.SendingContentModel += EditorModelEventManager_SendingContentModel;
    }

    public void Terminate() { return; }

    private void EditorModelEventManager_SendingContentModel(HttpActionExecutedContext sender, EditorModelEventArgs<ContentItemDisplay> e) {
        SetDefaultValue(e, new string[] { "news" }, "date", DateTime.Now.Date);
    }

    private void SetDefaultValue(EditorModelEventArgs<ContentItemDisplay> e,  string[] docTypeAliases, string propertyAlias, object newValue) {
        try {
            if(docTypeAliases.Contains(e.Model.ContentTypeAlias))
            {
                //Here we need to consider variants
                foreach(var variant in e.Model.Variants)
                {
                    var props = variant.Tabs.SelectMany( t =>
                            t.Properties.Where(p =>
                                p.Alias.Equals(propertyAlias) &&
                                (p.Value == null || string.IsNullOrWhiteSpace(p.Value.ToString()))));

                    foreach(var prop in props)
                        prop.Value = newValue;
                }
            }
        }
        catch (Exception ex)
        {
            logService.Error(GetType(), ex, "Error occurred setting default value");
        }
    }
}

public class EditorModelComposer : IUserComposer
{
    public void Compose(Composition composition) {
        composition.Components().Append<EditorModelComponent>();
    }
}