Trouble with Date formatting in Sql Server 2008, ASP.net, and then Javascript

I'm writing an Asp.net in C# application that retrieves data from Sql Server 2008 and converts it to JSON so it can be placed on a Google Map.  Trying to figure out the proper way to handle date formatting is driving me crazy.

In Sql Server, the date column is an nvarchar (and there is nothing I can do about that).   Sometimes this column is like 18-OCT-10 17:36, 4/8/2009 11:34:00 AM, 3/3/11, or is just null or blank.  For testing I'm retrieving rows that are 6/15/14.  If I don't do any CASTS or CONVERTS with t-sql and bring it into my asp.net application like this...

dsGetFieldPoints.SelectParameters["trackID"].DefaultValue = trkID;
var fieldPts = dsGetFieldPoints.Select(DataSourceSelectArguments.Empty) as DataView;
var fieldPtMarkers = new List<FieldPoint>();

            foreach (DataRowView pt in fieldPts)
            {
                FieldPoint fp = new FieldPoint();
                fp.locDate = (string)pt["locDate"];
                fieldPtMarkers.Add(fp);
            }
            JavaScriptSerializer js = new JavaScriptSerializer();
            var fieldPtsJson = js.Serialize(fieldPtMarkers);
            var fieldPtsJsonFinal = "{\"fieldPoints\": " + fieldPtsJson + "}";
            ClientScript.RegisterStartupScript(this.GetType(), "Google Maps Initialization and Add Pts",
                      string.Format("initializeMap({0}, {1});", photosJson, fieldPtsJsonFinal), true);

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In the JSON output the date looks like this - "6/15/14", but when I use javascript....

var fDate = new Date(fMarker.locDate);
fDate.toDateString()

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I get this Mon  6/14/1914.   So I'm using a With clause in my t-sql statement and I try this....

With fieldPts AS 
		(SELECT 		
		CAST(ISNULL(fp1.Loc_Date, '') AS DATE) AS locDate....)
SELECT 
CAST(fp.locDate AS NVARCHAR) AS locDate....

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In the JSON output the date looks like this "2014-06-15", but when I use the javascript it looks like this Sat  6/14/2014.   So I try not converting it back to nvarchar....

With fieldPts AS 
		(SELECT 		
		CAST(ISNULL(fp1.Loc_Date, '') AS DATE) AS locDate....)
SELECT 
fp.locDate....

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And then updating my asp.net code to .....

fp.locDate = (DateTime)pt["locDate"];

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the JSON output looks like this "\/Date(1402808400000)\/" and the javascript produces undefined  Invalid Date.
In my t-sql I've tried using CONVERT...

convert(date, CAST(ISNULL(fp1.Loc_Date, '') AS DATE), 112) AS locDate

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but it doesn't seem to work since I always get the same format of 2014-06-15.   What can I do now?  Thanks