<?php
// Add/Subtract days from a date
function dateMath($startDate, $math)
{
$math = $math." day";
$date = new DateTime($startDate);
$date->modify($math);
return($date->format('Y-m-d'));
}
echo dateMath('2016-11-17', -1);
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
2016-11-16