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    <ul> <li><p>TIMESTAMP is stored in a MySQL proprietary method (though it's basically just a string consisting of year, month, day, hour, minutes and seconds) and additionally, a field of type TIMESTAMP is automatically updated whenever the record is inserted or changed and no explicit field value is given:</p> <pre><code>mysql&gt; create table timestamp_test( id integer not null auto_increment primary key, val varchar(100) not null default '', ts timestamp not null); Query OK, 0 rows affected (0.00 sec) mysql&gt; insert into timestamp_test (val) values ('foobar'); Query OK, 1 row affected (0.00 sec) mysql&gt; select * from timestamp_test; +----+--------+----------------+ | id | val | ts | +----+--------+----------------+ | 1 | foobar | 20090122174108 | +----+--------+----------------+ 1 row in set (0.00 sec) mysql&gt; update timestamp_test set val = 'foo bar' where id = 1; Query OK, 1 row affected (0.00 sec) Rows matched: 1 Changed: 1 Warnings: 0 mysql&gt; select * from timestamp_test; +----+---------+----------------+ | id | val | ts | +----+---------+----------------+ | 1 | foo bar | 20090122174123 | +----+---------+----------------+ 1 row in set (0.00 sec) mysql&gt; </code></pre></li> <li><p>DATETIME is the standard data type for dates and times which works in conjunction with the date and time functions in MySQL. I'd probably use this in practice</p></li> <li>Storing dates in INTEGER format is not recommended, as you are opening a real can of worms due to interesting problems like time zones, leap years and the like - at least if you intend to query the database based on specific dates stored in that field.</li> </ul>
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    1. POWhat are the pros and cons of the various date/time field types in MySQL?
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    1. COThank you very much for example with auto-changing field. It's very important to know (for me, at least).
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