An easy one today. I often have to remind myself of how to convert a MySQL datetime to something a little more usable... a UNIX timestamp.
The strototime version
It is incredibly easy, just use the PHP strtotime function.
$timestamp=strtotime($result->my_datetime);
Now you can print the date in any format you want:
printdate("Y-m-d H:i:s",$timestamp);
PHP5 Convert MySQL Datetime to PHP date format
If you are using PHP5, the following should accomplish the same thing.