Proper way to store date and time values in MySQL -
http://www.webdevelopersdiary.com/1/post/2012/06/good-to-know-how-to-properly-store-date-and-time-values-in-mysql.html
http://www.webdevelopersdiary.com/1/post/2012/06/good-to-know-how-to-properly-store-date-and-time-values-in-mysql.html