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<?php $one = new DateTime('2015-11-15 07:00:57'); $two = new DateTime('2016-01-08 04:04:35'); echo $two->getTimestamp() - $one->getTimestamp(); print_r($one->diff($two));
Output for 8.2.0 - 8.2.18, 8.3.0 - 8.3.7
4655018DateInterval Object ( [y] => 0 [m] => 1 [d] => 23 [h] => 21 [i] => 3 [s] => 38 [f] => 0 [invert] => 0 [days] => 53 [from_string] => )
Output for 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28
4655018DateInterval Object ( [y] => 0 [m] => 1 [d] => 23 [h] => 21 [i] => 3 [s] => 38 [f] => 0 [weekday] => 0 [weekday_behavior] => 0 [first_last_day_of] => 0 [invert] => 0 [days] => 53 [special_type] => 0 [special_amount] => 0 [have_weekday_relative] => 0 [have_special_relative] => 0 )
Output for 5.5.24 - 5.5.35, 5.6.8 - 5.6.28, 7.0.0 - 7.0.20
4655018DateInterval Object ( [y] => 0 [m] => 1 [d] => 23 [h] => 21 [i] => 3 [s] => 38 [weekday] => 0 [weekday_behavior] => 0 [first_last_day_of] => 0 [invert] => 0 [days] => 53 [special_type] => 0 [special_amount] => 0 [have_weekday_relative] => 0 [have_special_relative] => 0 )

preferences:
159.31 ms | 402 KiB | 229 Q