public static string ToServerDateString(string date) {
        string culture = GetGlobalProperty("serverCulture");
        DateTime dt = DateTime.Parse(date, new CultureInfo(culture));
        CultureInfo ci = new CultureInfo(culture);
        return dt.ToString("d", ci);
    }
    public static string ToClientDateString(string date) {
        string culture = GetGlobalProperty("clientCulture");
        DateTime dt = DateTime.Parse(date);
        CultureInfo ci = new CultureInfo(culture);
        return dt.ToString("d", ci);
    }