public static string GetAgeByBirthday(string birthday, string currentDate) { DateTime dateBirthday; DateTime dateCuurrent; if (DataValidateManager.ValidateDateFormat(birthday)) { dateBirthday = DateTime.Parse(birthday); if (DataValidateManager.ValidateDateFormat(currentDate)) { dateCuurrent = DateTime.Parse(currentDate); } else { dateCuurrent = DateTime.Now; } return(RoundInt((dateCuurrent - dateBirthday).Days / 365).ToString()); } return("0"); }