razor - asp.net mvc 5 html.DisplayFor DisplayFormat Display(Name) not working -

html.displayfor stopped displaying display name , formatted string... code bellow ... ideas? have searched around couldn't find anything. thanks

[displayformat(dataformatstring = "{0:mm/dd/yyyy}")] [display(name = "date")] public datetime eventdatetimeday { get; set; }  [display(name = "seconds")] [displayformat(dataformatstring = "{0:0.00} s")] public double duration { get; set; } 

razor .cshtml:

@model ienumerable<ourclass> ...         <th>             @html.displaynamefor(model => model.eventdatetimeday)         </th>  ...     @foreach (var item in model)     { ...             <td>             @html.displayfor(modelitem => item.eventdatetimeday)             </td> 

you should try using displayname attribute

    [displayname("seconds")]     public double duration { get; set; }