How to get current user time on client side (JavaScript)

Recently I got requirement to fill-in field on a web resource with current user time (CRM settings should be took into account).

I use following code to implement requirement:
1. Retrieve user settings 2. Ask server to execute UtcTimeToLocalTime request with user time zone provided

This is code:

DateTimeHelper = {};

(function (DateTimeHelper, jQuery, $) {

    DateTimeHelper.GetUserLocalTime = function (date) {
        var userId = context().getUserId();
        var settings = getCurrentUserSettings(userId);
        var timeZoneCode = settings.TimeZoneCode;
        var dateTime = Teoco.DateTimeHelper.UtcTimeToLocalTime(timeZoneCode, date);
        return dateTime;
    };

    DateTimeHelper.UtcTimeToLocalTime = function (timeZoneCode, dateTime) {
        var req = getXhr();
        req.open("POST", getServicePath(), false);
        req.setRequestHeader("SOAPAction", "http://schemas.microsoft.com/xrm/2011/Contracts/Services/IOrganizationService/Execute");
        req.setRequestHeader("Content-Type", "text/xml; charset=utf-8");

        var xml =
            "<s:Envelope xmlns:s='http://schemas.xmlsoap.org/soap/envelope/'>" +
            "  <s:Body>" +
            "    <Execute xmlns='http://schemas.microsoft.com/xrm/2011/Contracts/Services' xmlns:i='http://www.w3.org/2001/XMLSchema-instance'>" +
            "      <request i:type='b:LocalTimeFromUtcTimeRequest' xmlns:a='http://schemas.microsoft.com/xrm/2011/Contracts' xmlns:b='http://schemas.microsoft.com/crm/2011/Contracts'>" +
            "        <a:Parameters xmlns:c='http://schemas.datacontract.org/2004/07/System.Collections.Generic'>" +
            "          <a:KeyValuePairOfstringanyType>" +
            "            <c:key>TimeZoneCode</c:key>" +
            "            <c:value i:type='d:int' xmlns:d='http://www.w3.org/2001/XMLSchema'>" + timeZoneCode + "</c:value>" +
            "          </a:KeyValuePairOfstringanyType>" +
            "          <a:KeyValuePairOfstringanyType>" +
            "            <c:key>UtcTime</c:key>" +
            "            <c:value i:type='d:dateTime' xmlns:d='http://www.w3.org/2001/XMLSchema'>" + dateTime.toISOString() + "</c:value>" +
            "          </a:KeyValuePairOfstringanyType>" +
            "        </a:Parameters>" +
            "        <a:RequestId i:nil='true' />" +
            "        <a:RequestName>LocalTimeFromUtcTime</a:RequestName>" +
            "      </request>" +
            "    </Execute>" +
            "  </s:Body>" +
            "</s:Envelope>";

        req.send(xml);

        var date = null;

        if (req.status === 200) {
            var resultXml = req.responseXML;
            var dateString = $(resultXml).find("value").text()
            date = new Date(dateString);
        }
        else {
            alert("Failed to retrieve current user local time");
            throw "Failed to retrieve current user local time";
        }

        return date;
    };

    function getCurrentUserSettings(userId) {
        var request = "/UserSettingsSet?$filter=SystemUserId eq guid'" + userId + "'";

        var settings = null;

        callOData(request,
            function (data) {
                if(data != null && data.results != null && data.results.length != 0)
                {
                    settings = data.results[0];
                }
            },
            function (xhr) {
            });

        if (settings == null) {
            alert("Failed to load current user settings");
            throw "Failed to load current user settings";
        }

        return settings;
    }

    function callOData(request, onSuccess, onError) {
        var req = getXhr();
        req.open("GET", getODataPath() + request, false);
        req.setRequestHeader("Accept", "application/json");
        req.setRequestHeader("Content-Type", "application/json; charset=utf-8");

        req.send();

        if (req.status === 200) {
            onSuccess(JSON.parse(req.responseText).d);
        }
        else {
            onError(req);
        }
    }

    function getServicePath() {
        return getClientUrl() + "/XRMServices/2011/Organization.svc/web";
    }

    function getODataPath() {
        return getClientUrl() + "/XRMServices/2011/OrganizationData.svc/";
    }

    function getClientUrl() {
        var serverUrl = typeof context().getClientUrl !== "undefined" ? context().getClientUrl() : context().getServerUrl();
        if (serverUrl.match(/\/$/)) {
            serverUrl = serverUrl.substring(0, serverUrl.length - 1);
        }
        return serverUrl;
    }

    function context() {
        var oContext;
        if (typeof window.GetGlobalContext != "undefined") {
            oContext = window.GetGlobalContext();
        }
        else {
            if (typeof Xrm != "undefined") {
                oContext = Xrm.Page.context;
            }
            else if (typeof window.parent.Xrm != "undefined") {
                oContext = window.parent.Xrm.Page.context;
            }
            else {
                throw new Error("Context is not available.");
            }
        }
        return oContext;
    }

    function getXhr() {
        if (XMLHttpRequest) {
            return new XMLHttpRequest();
        }
        try {
            return new ActiveXObject('MSXML2.XMLHTTP.6.0');
        } catch (e) {
            try {
                return new ActiveXObject('MSXML2.XMLHTTP.3.0');
            } catch (e) {
                alert('This browser is not AJAX enabled.');
                return null;
            }
        }
    }

})(DateTimeHelper, jQuery, jQuery);

And this is usage example:

var today = Teoco.DateTimeHelper.GetUserLocalTime(new Date());