- date_default_timezone_set: documentation ( source)
- date: documentation ( source)
- strtotime: documentation ( source)
<?php
date_default_timezone_set('America/Montevideo');
$hoy = date('d-m-Y H:i:s');
$hoystr = strtotime($hoy);
$mañana = date('d-m-Y H:i:s',strtotime('+1 day', $hoystr));
echo $hoy;
echo "\n";
echo $mañana;