- 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 $mañana;
echo "\n";
echo strtotime(date('H:i',$hoystr));
echo "\n";
echo strtotime('09:00:00');
echo "\n";
echo date('H:i',strtotime(date('H:i',$hoystr))-strtotime('09:00:00'));