DROP TABLE IF EXISTS timestamps;
CREATE TABLE timestamps (
id INT PRIMARY KEY AUTO_INCREMENT,
create_dt DATETIME
) DEFAULT CHARSET UTF8;
SHOW CREATE TABLE timestamps;
Table	Create Table
timestamps	CREATE TABLE `timestamps` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `create_dt` datetime DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=Mroonga DEFAULT CHARSET=utf8
INSERT INTO timestamps (create_dt) VALUES ("2012-00-01 00:00:00");
Warnings:
Warning	1265	Data truncated for column 'create_dt' at row 1
INSERT INTO timestamps (create_dt) VALUES ("2012-01-00 00:00:00");
Warnings:
Warning	1265	Data truncated for column 'create_dt' at row 1
SELECT * FROM timestamps;
id	create_dt
1	2012-01-01 00:00:00
2	2012-01-01 00:00:00
SELECT * FROM timestamps WHERE create_dt = "2012-01-01 00:00:00";
id	create_dt
1	2012-01-01 00:00:00
2	2012-01-01 00:00:00
DROP TABLE timestamps;