รบกวนดูโค้ดให้หน่อยครับ ทำแล้วมันไม่แสดงผล ตามที่ต้องการ

$sql = "SELECT tb_time.name, tb_time.day, tb_time.date, tb_time1.date1, tb_time2.date2, tb_time3.date3 ";
$sql .= "FROM tb_time, tb_time1, tb_time2, tb_time3 ";
$sql .= "WHERE tb_time.name = tb_time1.name AND tb_time.name = tb_time2.name AND tb_time.name = tb_time3.name";
$sql .= "GROUP by tb_time.day";
$sql .= "ORDER by name ";

$sql = "SELECT tb_time.name, tb_time.day, tb_time.date, tb_time1.date1, tb_time2.date2, tb_time3.date3 ";
$sql .= "FROM tb_time, tb_time1, tb_time2, tb_time3 ";
$sql .= "GROUP by tb_time.day,tb_time.name ";
$sql .= "ORDER by name ";

SELECT tb_time.name, tb_time.day, tb_time.date, tb_time1.date1, tb_time2.date2, tb_time3.date3
FROM tb_time
LEFT JOIN tb_time1 ON tb_time.name = tb_time1.name1
LEFT JOIN tb_time2 ON tb_time.name = tb_time2.name2
LEFT JOIN tb_time3 ON tb_time.name = tb_time3.name3
GROUP BY tb_time.day, tb_time.name
ORDER BY tb_time.day, tb_time.name

<?php
include "connect.php";
$sql=" SELECT  date1 from tb_time1  ";
$result=mysql_db_query($dbname,$sql);
while($record=mysql_fetch_array($result)) {
$date1 = $record[date1];
} 
//echo "$date1</br>";

$sql=" SELECT  date2 from tb_time2  ";
$result=mysql_db_query($dbname,$sql);
while($record=mysql_fetch_array($result)) {
$date2 = $record[date2];
} 
//echo "$date2</br>";
$dif = strtotime($date2) - strtotime($date1);

class Duration1
{
    function toString ($duration, $periods = null)
    {
        if (!is_array($duration)) {
            $duration = Duration1::int2array($duration, $periods);
        }
 return Duration1::array2string($duration);
    }
    function int2array ($seconds, $periods = null)
    {        
        // Define time periods
        if (!is_array($periods)) {
            $periods = array (
                    'years'     => 31556926,
                    'months'    => 2629743,
                    'weeks'     => 604800,
                    'days'      => 86400,
                    'hours'     => 3600,
                    'minutes'   => 60,
                    'seconds'   => 1
                    );
        }
        $seconds = (float) $seconds;
        foreach ($periods as $period => $value) {
            $count = floor($seconds / $value);
 
            if ($count == 0) {
                continue;
            }
 
            $values[$period] = $count;
            $seconds = $seconds % $value;
        }
        if (empty($values)) {
            $values = null;
        }
 
        return $values;
    }
    function array2string ($duration)
    {
        if (!is_array($duration)) {
            return false;
        }
 
        foreach ($duration as $key => $value) {
            $segment_name = substr($key, 0, -1);
            $segment = $value . ' ' . $segment_name; 
 
            // Plural
            if ($value != 1) {
                $segment .= 's';
            }
 
            $array[] = $segment;
        }
 
        $str = implode(', ', $array);
        return $str;
    }
 
}
 
// Convert to a string
echo"มาทำงานตอนเที่ยง ช้าเป็นเวลา  " ;
echo Duration1::toString($dif);
 
?>

$dif = strtotime($date2) - strtotime($date1);

$startTimeMorning = "08:00:00";

$dif = strtotime($date1) - strtotime($startTimeMorning );

$startTimeAfternoon = "13:00:00";

$dif2 = strtotime($date2) - strtotime($startTimeAfternoon );