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<?php $ts = strtotime('2010-01-31 +1 month'); echo date('Y-m-d', $ts); echo "\n"; $dt = new \DateTime('2010-01-31'); $dt->add(new \DateInterval('P1M')); echo $dt->format('Y-m-d'); echo "\n"; $ts = strtotime('2010-01-05 +1 month'); echo date('Y-m-d', $ts); echo "\n"; $dt = new \DateTime('2010-01-05'); $dt->add(new \DateInterval('P1M')); echo $dt->format('Y-m-d'); echo "\n"; $ts1 = strtotime('2010-01-31 +1 month'); $ts2 = strtotime('first day of next month'); $ts3 = strtotime('last day of this month', $ts2); $ts = $ts1; if ($ts1 > $ts3) { $ts = $ts3; } echo date('Y-m-d', $ts);

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