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<?php $startDate = new DateTime('@' . mktime(0, 0, 0, date("m"), date("d") - 7, date("Y"))); $optionalStartDate = '2018-01-01 00:00:00'; print_r($startDate);
Output for 5.6.38, 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 - 8.3.4, 8.3.6
DateTime Object ( [date] => 2018-10-22 22:00:00.000000 [timezone_type] => 1 [timezone] => +00:00 )
Output for 8.3.5
Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0 DateTime Object ( [date] => 2018-10-22 22:00:00.000000 [timezone_type] => 1 [timezone] => +00:00 )
Output for 7.3.32 - 7.3.33, 8.0.13
DateTime Object ( [date] => 2018-10-23 00:00:00.000000 [timezone_type] => 1 [timezone] => +00:00 )

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