namespace FamilyTreeAPI.Helper { public class Helpers { public static string? DateToStr(DateTime? date) { string? result = null; if (date.HasValue) { result = date.Value.ToString("yyyy-MM-dd"); } return result; } public static DateTime? DateToDateTime(string? date) { DateTime? result = null; if (!string.IsNullOrEmpty(date)) { DateTime dt; if (DateTime.TryParse(date, out dt)) { result = dt; } } return result; } } }