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if (!string.IsNullOrEmpty(contactBirthday))
                    {
                        contactBirthday = DateTime.FromOADate(Convert.ToInt32(contactBirthday)).ToString("d");
                        DateTime contactBirthdayValue;
                        DateTime.TryParse(contactBirthday, out contactBirthdayValue);
                        contactItem.CONTACT_BIRTHDAY = contactBirthdayValue;
                    }