<?php
$num=5;
$timeUnit="01:02";
$current=strtotime($timeUnit); //seconds of current time
$add=$num*60; // convert the $num into seconds
echo date("H:i",$current+$add);
Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0
01:07