Time Difference script using PHP

<?php

$date1 = strtotime("2016-06-01 22:45:00"); 

$date2 = strtotime("2018-09-21 10:44:01"); 

  

$diff = abs($date2 - $date1); 

$years = floor($diff / (365*60*60*24)); 

$months = floor(($diff - $years * 365*60*60*24)

                               / (30*60*60*24)); 

$days = floor(($diff - $years * 365*60*60*24 - 

             $months*30*60*60*24)/ (60*60*24));

  

$hours = floor(($diff - $years * 365*60*60*24 

       - $months*30*60*60*24 - $days*60*60*24)

                                   / (60*60)); 

$minutes = floor(($diff - $years * 365*60*60*24 

         - $months*30*60*60*24 - $days*60*60*24 

                          - $hours*60*60)/ 60); 

  

$seconds = floor(($diff - $years * 365*60*60*24 

         - $months*30*60*60*24 - $days*60*60*24

                - $hours*60*60 - $minutes*60)); 

  

// Print the result

printf("%d years, %d months, %d days, %d hours, "

     . "%d minutes, %d seconds", $years, $months,

             $days, $hours, $minutes, $seconds); 

?>