Find total time using mysql query when you have two datetime fields.

Question

SELECT SEC_TO_TIME(SUM(TIME_TO_SEC(TIMEDIFF(date_out,date_in)))) as total FROM mytable

Also you can find this using php code which is Find total time using mysql query when you have two datetime fields.

function sum_the_time($time1, $time2) {
  $times = array($time1, $time2);
  $seconds = 0;
  foreach ($times as $time)
  {
    list($hour,$minute,$second) = explode(':', $time);
    $seconds += $hour*3600;
    $seconds += $minute*60;
    $seconds += $second;
  }
  $hours = floor($seconds/3600);
  $seconds -= $hours*3600;
  $minutes  = floor($seconds/60);
  $seconds -= $minutes*60;
  // return "{$hours}:{$minutes}:{$seconds}";
  return sprintf('%02d:%02d:%02d', $hours, $minutes, $seconds);
}

function diff_the_time($time1, $time2) {
 $seconds=strtotime($time1)-strtotime($time2);
  $hours = floor($seconds/3600);
  $seconds -= $hours*3600;
  $minutes  = floor($seconds/60);
  $seconds -= $minutes*60;
  // return "{$hours}:{$minutes}:{$seconds}";
  return sprintf('%02d:%02d:%02d', $hours, $minutes, $seconds);
}