function TimezoneCookieExists() {
    var result = false;
    var date = new Date();
    var timezoneOffsetCookie = getCookie("TimezoneOffset");

    if (timezoneOffsetCookie != null &&
        timezoneOffsetCookie == (date.getTimezoneOffset() / 60 * -1) &&
        !firstTimeSetTimezoneCookie) //firstTimeSetTimezoneCookie from base.Master
        result = true;

    return result;
}