Compare two dates for a few days

There are times when we need to know the difference between two dates, such as the calculation of the article from the date of release to the current average number of clicks, the following example provides a good idea

? Php
$Date _1= "2003-7-15";//format can also be: $Date _1= "2003-6-25 23:29:14";
$Date _2= "1982-10-1";
$Date _list_1=explode ("-", $Date _1);
$Date _list_2=explode ("-", $Date _2);
$d 1=mktime (0,0,0, $Date _list_1[1], $Date _list_1[2], $Date _list_1[0]);
$d 2=mktime (0,0,0, $Date _list_2[1], $Date _list_2[2], $Date _list_2[0]);
$Days =round (($d 1-$d 2)/3600/24);
Echo "I have struggled for $Days days";
?>