ISO8601 Date Time helpers

iso8601Datetime.cs

    public static class DateTimeHelpers
    {
        private static readonly string[] Iso8601Format = new[]
                                                             {
                                                                 "yyyy'-'MM'-'dd'T'HH':'mm':'ss'Z'",
                                                                 @"yyyy-MM-dd\THH:mm:ssK"
                                                             };

        //SortableDateTimePattern (ISO 8601)  
        public static string ToIso8601(DateTime value)
        {
            return value.ToUniversalTime().ToString(Iso8601Format[0], CultureInfo.InvariantCulture);
        }

        public static DateTime ParseIso8601(string value)
        {
            return DateTime.ParseExact(value, Iso8601Format, CultureInfo.InvariantCulture, DateTimeStyles.AssumeUniversal | DateTimeStyles.AdjustToUniversal);
        }
    }