Why isn't the field value updated?

Question

ASP.NET

There is a Profile model, which I pass to the View and edit there

public class Profile
    {
        public int Id { get; set; }

        public int UserId { get; set; }
        public virtual User User { get; set; }

        public string FirstName { get; set; }
        public string LastName { get; set; }
        public int Age { get; set; }
        public DateTime LastUpdateDate { get; set; }
        public string Avatar { get; set; }
    }

Here is the form in the View

@using(Html.BeginForm("EditProfile","Profile"))
{ 
    @Html.LabelFor(m => m.Age)
    @Html.EditorFor(m => m.Age)
    @Html.LabelFor(m => m.Avatar)
    @Html.EditorFor(m => m.Avatar)
    @Html.LabelFor(m => m.FirstName)
    @Html.EditorFor(m => m.FirstName)
    @Html.LabelFor(m => m.LastName)
    @Html.EditorFor(m => m.LastName)    
    @Html.HiddenFor(m=>m.Id)
    @Html.HiddenFor(m => m.LastUpdateDate,new { value=DateTime.Now})
    @Html.HiddenFor(m => m.UserId)
    <input type="submit" value="Сохранить">
}

The LastUpdateDate field is not updating to "DateTime.Now" maybe I'm changing the field incorrectly?