PHP计算日期差异

2. date_default_timezone_set("Asia/Calcutta");
4. function dt_differ($start, $end){
5. $start = date("G:i:s:m:d:Y", strtotime($start));
6. $date1=explode(":", $start);
8. $end = date("G:i:s:m:d:Y", strtotime($end));
9. $date2=explode(":", $end);
11. $starttime = mktime(date($date1[0]),date($date1[1]),date($date1[2]),
12. date($date1[3]),date($date1[4]),date($date1[5]));
13. $endtime = mktime(date($date2[0]),date($date2[1]),date($date2[2]),
14. date($date2[3]),date($date2[4]),date($date2[5]));
16. $seconds_dif = $starttime-$endtime;
18. return $seconds_dif;
19. }

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PHP