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<?php $years = [ -25000, 0, 9999, 10000, 25000, ]; foreach ($years as $year) { $dt1 = date_create_from_format('d/m/Y', "22/09/$year"); $dt2 = new \DateTime(); $dt2->setDate($year, 9, 22); var_dump($year, $dt1, $dt2); echo "\n"; }

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