mysql自动生成时间

CREATE TABLE order(
order_id INT PRIMARY KEY auto_increment,
user_id INT,
course_id INT,
order_date datetime DEFAULT CURRENT_TIMESTAMP,#自动生成时间
status INT,
CONSTRAINT FK_ID1 FOREIGN KEY(user_id) REFERENCES user(user_id),
CONSTRAINT FK_ID2 FOREIGN KEY(course_id) REFERENCES course(course_id)
)