This gist allows you to parse an ISO 8601 subset date in JavaScript. This method could be used in a JSON reviver function to inflate date strings into date objects.

ParseISODate.js

!function () {
    var isoDateFormat = /^(\d{4})(?:-(\d{2})(?:-(\d{2})(?:T(\d{2}):(\d{2})(?::(\d{2})(\.\d+)?)?(?:(Z(?=$)|(?:\+|\-)(?=\d{2}:\d{2}))(?:(\d{2}):(\d{2}))?)?)?)?)?$/;
    Date.parseIsoDate = function (isoDate, convertToBrowserTimeZone) {
        /// <summary>
        /// Parses an ISO date.
        /// </summary>
        /// <param name="isoDate">The ISO date to parse.</param>
        /// <param name="convertToBrowserTimeZone" optional="true">Whether or not to convert the date to the browser's time zone (true by default).</param>
        /// <returns>A date.</returns>
        /// <remarks>
        /// This method adheres to the standard noted here: http://www.w3.org/TR/NOTE-datetime.
        /// In addition to the standard, this method also supports dates without time zone information.
        /// Such dates are assumed to be in the browser's time zone.
        /// </remarks>
        
        // convert to the browser's time zone unless otherwise specified
        convertToBrowserTimeZone = typeof convertToBrowserTimeZone !== "boolean" ? true : convertToBrowserTimeZone;
        
        // parse date
        var isoDateMatch = isoDateFormat.exec(isoDate);
        if (!isoDateMatch) throw "Invalid date specified.";
        
        // get date components
        var fullYear = +isoDateMatch[1];
        var month = (+(isoDateMatch[2] || 1) - 1);
        var day = +(isoDateMatch[3] || 1);
        var hours = +(isoDateMatch[4] || 0);
        var minutes = +(isoDateMatch[5] || 0);
        var seconds = +(isoDateMatch[6] || 0);
        var milliseconds = Math.round((+(isoDateMatch[7] || 0)) * 1000);
        
        // get minutes offset
        var minutesOffset = isoDateMatch[8] && isoDateMatch[8] !== "Z" ? ((+isoDateMatch[9]) * 60) + (+isoDateMatch[10]) : 0;
        if (isoDateMatch[8] === "-") {
            minutesOffset = 0 - minutesOffset;
        }
        
        // create and return date
        var setMethodPrefix = "set";
        if (convertToBrowserTimeZone && isoDateMatch[8]) {
            setMethodPrefix += "UTC";
            minutes -= minutesOffset;
        }
        var date = new Date(0);
        date[setMethodPrefix + "FullYear"](fullYear, month, day);
        date[setMethodPrefix + "Hours"](hours, minutes, seconds, milliseconds);
        return date;
    };
}();