strtotime

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echo date("Y/m/d h:i:s");
echo "<br>";
echo date("Y/m/d h:i:s", strtotime(" - 2 sec"));
 
echo "<br>";
echo "<br>";
$date = "2018/05/20 12:30:00";
echo date("Y/m/d h:i:s", strtotime("$date -1 day"));
echo "<br>";
echo date("Y/m/d h:i:s", strtotime("$date -10 sec"));