SQL

mysql insert value date

UPDATE personal set birthday = STR_TO_DATE('1-01-2012', '%d-%m-%Y') where birthday IS NULL;

insert current date in mysql

INSERT INTO my_table (last_updated) VALUES(NOW());
INSERT INTO my_table (last_updated) VALUES(sysdate);	-- Oracle
INSERT INTO my_table (last_updated) VALUES(getdate());	-- SQL Server

adding current date time in mysql query

NOW()