Fixes "strftime() expects parameter 2 to be integer, string given" PHP Warning, and PHP <7 compatibility issue. #46
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As mentioned in PR #43 there was another warning, when the int being read was a string, and not just a float (which is what #43 fixed). Additionally, the fix uses PHP_INT_MIN, which I didn't realise only exists in PHP 7. I didn't notice it because I'm running it, but I did when I tested in other versions of PHP.