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copied!<p>MySQL <em>does</em> allow <code>NULL</code> values for <code>datetime</code> fields. I just tested it:</p> <pre><code>mysql> create table datetimetest (testcolumn datetime null default null); Query OK, 0 rows affected (0.10 sec) mysql> insert into datetimetest (testcolumn) values (null); Query OK, 1 row affected (0.00 sec) mysql> select * from datetimetest; +------------+ | testcolumn | +------------+ | NULL | +------------+ 1 row in set (0.00 sec) </code></pre> <p>I'm using this version:</p> <pre><code>mysql> select version(); +-----------+ | version() | +-----------+ | 5.0.45 | +-----------+ 1 row in set (0.03 sec) </code></pre> <p>EDIT #1: I see in your edit that the error message you are getting in PHP indicates that you are passing an empty string (i.e. <code>''</code>), not <code>null</code>. An empty string is different than <code>null</code> and is not a valid <code>datetime</code> value which is why you are getting that error message. You must pass the special sql keyword <code>null</code> if that's what you mean. Also, don't put any quotes around the word <code>null</code>. See my <code>insert</code> statement above for an example of how to insert <code>null</code>.</p> <p>EDIT #2: Are you using PDO? If so, when you bind your null param, make sure to use the <code>[PDO::PARAM_NULL][1]</code> type when binding a <code>null</code>. See the <a href="https://stackoverflow.com/questions/1391777/how-do-i-insert-null-values-using-pdo/1391796#1391796">answer to this stackoverflow question</a> on how to properly insert <code>null</code> using PDO.</p>

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