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<?php $di = (new DateTime('2012-10-20'))->diff(new DateTime('2012-12-10')); print_r((new DateTime('2015-09-30'))->add($di));
Output for 5.5.24 - 5.5.35, 5.6.8 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.31, 7.4.0 - 7.4.33, 8.0.0 - 8.0.12, 8.0.14 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
DateTime Object ( [date] => 2015-11-19 00:00:00.000000 [timezone_type] => 3 [timezone] => Europe/Amsterdam )
Output for 7.3.32 - 7.3.33, 8.0.13
DateTime Object ( [date] => 2015-11-19 00:00:00.000000 [timezone_type] => 3 [timezone] => UTC )

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