DROP TABLE IF EXISTS timestamps;
CREATE TABLE timestamps (
id INT PRIMARY KEY AUTO_INCREMENT,
create_dt DATE
) DEFAULT CHARSET UTF8MB4;
SHOW CREATE TABLE timestamps;
Table	Create Table
timestamps	CREATE TABLE `timestamps` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `create_dt` date DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=Mroonga DEFAULT CHARSET=utf8mb4
INSERT INTO timestamps (create_dt) VALUES ("2012-00-01");
Warnings:
Warning	1265	Data truncated for column 'create_dt' at row 1
INSERT INTO timestamps (create_dt) VALUES ("2012-01-00");
Warnings:
Warning	1265	Data truncated for column 'create_dt' at row 1
SELECT * FROM timestamps;
id	create_dt
1	2012-01-01
2	2012-01-01
SELECT * FROM timestamps WHERE create_dt = "2012-01-01";
id	create_dt
1	2012-01-01
2	2012-01-01
DROP TABLE timestamps;
