newbie date time question

I'm trying to convert a date and time string using strtotime() The date and time strings are the first entry in each line in a csv file in the form: 22/06/2011 9:47:20 PM, data1, data2,... I've been trying to use the following approach, without success: function read_data($filename) {

    $f = fopen($filename, 'r');
    while ($d = fgetcsv($f)) {

    	$format = 'd/m/Y h:i:s';
    	$dt = DateTime::createFromFormat($format, $d[0]);

        $data[] = array(strtotime($dt), $d[1]); //convert date/time
    }
    fclose($f);
    return $data;

} Obviously I'm not getting the $format line right, as the resulting $dt values are empty. (I have previously used this reading process successfully with better behaved date and time strings). Advice appreciated. DN