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@ 2014-06-15T00:04:33Z

<?php

$startTimeStamp = strtotime("1971/01/01");
$endTimeStamp = date("Y/m/d");

echo $timeDiff = abs($endTimeStamp - $startTimeStamp);

$numberDays = $timeDiff/86400;  // 86400 seconds in one day

// and you might want to convert to integer
echo $numberDays = intval($numberDays);

?>

Output
Performance
VLD
References
Branches

abs: documentation ( source)
date: documentation ( source)
strtotime: documentation ( source)

preferences:dark modelive preview

52.11 ms | 402 KiB | 5 Q