I don't quite understand the relation between JS and ASP.NET MVC 3 Razor. Javascript runs on the client side no matter which technology has been used on the server to generate the page. So on javascript an array is an array.

There are a couple of possibilities to define arrays of objects in javascript

var activeDates = [ '7-21-2011', '7-22-2011' ];

or:

var activeDates = new Array();

activeArrays.push('7-21-2011');

activeArrays.push('7-22-2011');

or yet:

var activeDates = new Array();

activeArrays[0] = '7-21-2011';

activeArrays[1] = '7-22-2011';

At th end all those represent the same array. But it is an array of strings, not dates.

If you wanted to have an array of dates, here's what you could do:

var activeDates = [ 

    new Date(2011, 6, 21, 0, 0, 0, 0), 

    new Date(2011, 6, 22, 0, 0, 0, 0) 

];

Now the only relation I can see with your question to ASP.NET MVC is that you probably have some array on your view model:

public class MyViewModel

{

    public DateTime[] ActiveDates { get; set; }

}

that you wanted to serialize and manipulate in a javascript array. In this case here's the syntax:

@model MyViewModel

<script type=text/javascript>

    var activeDates = @Html.Raw(Json.Encode(Model.ActiveDates));

</script>

Now because of the way DateTime fields are JSON serialized in .NET you will end up with the following in the generated HTML:

var activeDates = [/Date(1309471200000)/,/Date(1311199200000)/];

and if you wanted to convert this array of strings into an array of actual javascript dates:

var dates = $.map(activeDates, function(date, index) {

    date = date.replace('/Date(', '').replace(')/', '');  

    return new Date(parseInt(date));

});