for($z = 0; $z <= 24; $z++){
for($y = 0; $y < 60; $y++){
for($x = 0; $x < 60; $x++){
$myString = $z.":".$y.":".$x;
echo $myString." ";
$timestamp = strtotime($myString);
echo $timestamp." ";
setlocale(LC_TIME, "pt_BR");
echo strftime("%X",$timestamp)."<br/>";
}
}
}