Ajax encapsulating my json in more json

Question

I'm fairly new to using ajax with .net and also with using JSONs. The ajax seems to be encapsulating my JSON into another JSON.

Here is the ajax:

function updateChecks() {
    console.log("updateChecks() called");
    var Sunday = document.getElementById("Sundate").value;
    var Saturday = document.getElementById("Satdate").value;
    var jsonDates = JSON.stringify({ sundate: Sunday, satdate: Saturday });
    console.log(jsonDates);
    $.ajax(
    {
        method: 'Post',
        url: 'WPForm.aspx/getTheDates',
        data: jsonDates,
        dataType: "json",
        contentType: "application/JSON; charset=utf-8",
        success: function (result) { console.log(result); checkCheckedDates(result); },
        error: function (xhr, textStatus, errorThrown) { console.log(textStatus + " " + errorThrown); }
    }
)
};

And here is the c#

    [WebMethod]
    public static string getTheDates(string sundate, string satdate)
    {
        System.Diagnostics.Debug.WriteLine("GET THE DATES " + sundate + " " + satdate);

        WPUser currUser = new WPUser();
        SqlConnection wellnessProgramDB = new SqlConnection(ConfigurationManager.ConnectionStrings["WellnessProgram"].ConnectionString);

        int uID = currUser.getUID((string)HttpContext.Current.Session["username"]);

        string getDatesSQL = "select [Dates Checked] from WP_DatesChecked where [Employee ID] = '" + uID + "' and [Dates Checked] between '" + sundate + "' and '" + satdate + "';";
        SqlCommand getDates = new SqlCommand(getDatesSQL, wellnessProgramDB);

        wellnessProgramDB.Open();

        SqlDataReader dateReader = getDates.ExecuteReader();

        System.Data.DataTable dateTable = new System.Data.DataTable();
        dateTable.Load(dateReader);

        List<string> values = new List<string>();
        foreach (System.Data.DataRow row in dateTable.Rows)
        {
            object value = row["Dates Checked"];
            values.Add(value.ToString());
            System.Diagnostics.Debug.WriteLine("Value: " + value.ToString());
        }

        wellnessProgramDB.Close();

        string datesJson = JsonConvert.SerializeObject(values);

        System.Diagnostics.Debug.WriteLine("JSON: " + datesJson);

        return datesJson;

    }

When I log the JSON before sending it from the server, the JSON is correct. I get JSON: ["3/26/2017 12:00:00 AM","3/28/2017 12:00:00 AM","3/30/2017 12:00:00 AM"].

But when I log it after retrieving it, I get: Object { d: "["3/26/2017 12:00:00 AM","3/28/2017…" }.

I could be missing something minor, but any help is much appreciated!