public MyDate(byte day, byte month, int year)
{
Validate(day, month, year);
_dateStruct = new MyDateStruct(day, month, year);
}
/// <summary>
/// Операция инкремента даты по дням
/// </summary>
/// <param name="days">Число дней</param>
public void AddDays(int days)
{
var newDate = GetDateByDays(GetDaysCount() + days);
_dateStruct = newDate;
}