VSCrash

@model DateTime?
@{
    string name = ViewData.TemplateInfo.HtmlFieldPrefix;
    string id = name.Replace(".", "_");
    bool monthEndOnly = ViewBag.MonthEndOnly ?? false;
}

@Html.TextBoxFor(model => model, new { style = "DatePicker" })
<i class="icon-calendar"></i>

<script type="text/javascript">
    $(function () {
        $("#@id").datepicker({
            @if (monthEndOnly)
            {
                <text>
            beforeShowDay: function(date)
            {
                // getDate() returns the day [ 0 to 31 ]
                if (date.getDate() ==
                    (new Date((new Date(date.getFullYear(), date.getMonth() + 1, 1)) - 1)).getDate())
                {
                    return [true, ''];
                }

                return [false, ''];
            },
            </text>   
            }
            dateFormat: 'dd/mm/yy',
            changeMonth: true,
            changeYear: true,
            showOn: "button"
        });
        $("#@id").val($("#@id").val().substring(0, 10));
        $("#@id").addClass("dateITA");

        $(".icon-calendar").click(function() {
            $(this).prev(".ui-datepicker-trigger").click();
        });

        $("#@id").focus(function() {
            return false;
        });
    });
</script>