<?php header('Content-Type: text/plain; charset=utf-8'); echo $currentDate = "2013-10-31", PHP_EOL; $date = DateTime::createFromFormat('Y-m-d', $currentDate); $date->sub(new DateInterval('P1M')); echo $date->format('Y-m-d'), PHP_EOL; $date->add(new DateInterval('P1M')); echo $date->format('Y-m-d'), PHP_EOL; ?>
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