<?php $s = '2 months'; $n = strtotime('13 March 2014'); // curr = 5 // pstt = 7 // diff = 2 // trgt = 3 // curr - (pstt - curr) // 5 - (7 - 5) = 3 $t = $n - (strtotime($s, $n) - $n); echo date('M', $t);
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