Mysql-problems encountered when adding data to MySQL using CURDATE ()

After the Info table is created in MySQL, an error is displayed when inserting data, mainly in the addtime field. The related code is as follows: # Create a table createtableitem (...... Addtimedatenotnull, endtimedatenotnull ,...... # Insert data INSERTINTOitem (item_name, item_remark, item_desc, kind_id, addtime, endtime, init_price, max_price, owner_id,... mysql

After the Info table is created in MySQL, an error is displayed when inserting data, mainly in the addtime field. The related code is as follows:
# Table creation
Create table item (
......
Addtime date not null,
Endtime date not null,
......
# Insert data
Insert into item (item_name, item_remark, item_desc, kind_id, addtime, endtime, init_price, max_price, owner_id, winer_id, state_id)
VALUES ('mainboard ', 'old mainboard', 'old mainboard, you can also use ', 1, CURDATE ()-5, CURDATE () + INTERVAL 30 DAY, 230,250, 1, null, 1 );

I checked that the CURDATE () function can be used as a string or as a digital context. There are also examples of defining it as a Date type, so I initially thought the code is okay.
However, the following error still occurred on my computer after I entered it:
ERROR 1292 (22007): Incorrect date value: '20140901' for column 'addtime' at row 1
Please kindly advise