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@ 2013-11-10T00:02:14Z

<?php

if (class_exists('DateTime')) {
    $date = new DateTime('2013-10-31');
    print $date->modify('-1 month');
} else {
    print 'Not supported.';
}

Output
Performance
VLD
References
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class_exists: documentation ( source)

preferences:dark modelive preview

33.3 ms | 402 KiB | 5 Q