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<?php $periods = [ "2020-06-01", "2020-07-01", "2020-08-01", "2020-09-01", "2021-01-01", "2022-01-01", "2022-06-01", "2022-08-01", "2022-10-01", "2023-04-01", ]; foreach ($periods as $p) { date_sub($p, date_interval_create_from_date_string("1 week")); echo date_format($p,"Y-m-d"). '<br>'; }
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