PHP's DateTime-.add function works locally but not on server
<p>I'm stuck on this and don't know what else to try. This line of code works fine locally but fails on server. There is no error message. I just get a blank page.</p>

<p><code>$tempDate->add(new DateInterval('P1M'));</code></p>

<p>Any idea why I would see this behavior?</p>
