Assign format of DateTime with data annotations?
Try tagging it with:
[DisplayFormat(ApplyFormatInEditMode = true, DataFormatString = "{0:MM/dd/yyyy}")]
In mvc 4 you can easily do it like following using TextBoxFor
..
@Html.TextBoxFor(m => m.StartDate, "{0:MM/dd/yyyy}", new { @class = "form-control default-date-picker" })
So, you don't need to use any data annotation in model or view model class