Answers for "sub 1 month datetime php"

+1 month php

$time = strtotime("2010.12.11");
$final = date("Y-m-d", strtotime("+1 month", $time));

substract 2 dates php

$datetime1 = strtotime('May 3, 2012 10:38:22 GMT');
$datetime2 = strtotime('06 Apr 2012 07:22:21 GMT');

$secs = $datetime2 - $datetime1;// == <seconds between the two times>
$days = $secs / 86400;