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<?php $thisFriday = new \DateTimeImmutable('this friday 00:05'); $twoWeeksAgo = $thisFriday->modify("-2 week"); var_dump($twoWeeksAgo);
Output for 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 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.7
object(DateTimeImmutable)#2 (3) { ["date"]=> string(26) "2017-06-30 00:05:00.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" }
Output for 7.3.32 - 7.3.33, 8.0.13
object(DateTimeImmutable)#2 (3) { ["date"]=> string(26) "2017-06-30 00:05:00.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(3) "UTC" }

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