System.Data.Common.DateTimeStorage.ConvertValue C# (CSharp) Метод

        public override object ConvertValue(object value)
        {
            if (_nullValue != value)
            {
                if (null != value)
                {
                    value = ((IConvertible)value).ToDateTime(FormatProvider);
                }
                else
                {
                    value = _nullValue;
                }
            }
            return value;
        }