The mktime() function is used to find the future particular date after specifying the time peroid.
Example :
<?php
// Return future date
$futureDate = mktime(0,0,0,date("m")+30,date("d"),date("Y"));
echo date("d/m/Y", $futureDate);
?>
Output :
14/01/2021
As from the above example , it the date is displayed which falls 30 months after from the current date .