日期时间和日期时间之间的日期时间差异+日期

Question

尝试在数据库中使用日期时间并为其添加可变天数，然后找出旧日期和新日期之间的差异并显示它。我引用了http://php.net/manual/en/datetime.add.php和

$postdate = $row["dated"]; // db value(datetime) assume 2016-04-12 18:35:00
$timelength = $row["timelength"]; // db value(int) assume 180
//Start decode and organizing
$time1 = new DateTime($postdate);
$time111 = date_add($time1, date_interval_create_from_date_string(''.$timelength.' days'));
$time211 = $time111->diff($time1);
$time222 = $time211->format('%d days %h hours %i minutes');

$ time222回音输出为0天0小时0分钟

应该是170天##小时##分钟 我尝试了手册中的几种方法，请不要禁止我使用。

Answer 1

$time111 = date_add($time1, ...);

将$time1更改为新值，并将其分配给$time111

相反，做

$time1 = new DateTime($postdate);
$time2 = clone $time1;
$time111 = date_add($time2, date_interval_create_from_date_string(''.$timelength.' days'));