I have tried to find out what's wrong.
The table is conditions_loop. One column is condition_id, and the other one is a datetime type.
the code is this
$dt = date("Y-m-d H:i:s");
mysql_query("INSERT INTO conditions_loop (condition_id, date) VALUES ($latest_condition, $dt)") or die(mysql_error());
$latest_condition is a 1 digit integer.
The error says You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '13:12:14)' at line 1
I tried everything, but it's something I don't know. Thanks for reading.