- UNIX_TIMESTAMP関数
http://dev.mysql.com/doc/refman/5.1-olh/ja/date-and-time-functions.html#function_unix-timestamp - NOW関数
http://dev.mysql.com/doc/refman/5.1-olh/ja/date-and-time-functions.html#function_now - TIMESTAMPDIFF関数
http://dev.mysql.com/doc/refman/5.1-olh/ja/date-and-time-functions.html#function_timestampdiff
MySQLの日付時刻関数について
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