ternary_clock.php

<?php
date_default_timezone_set('Europe/Dublin');

function o($v) {
    for($i=3;$i>=0;$i--) {
        $set = false;
        $vn = pow(3,$i);
        for($y=2;$y>=1;$y--) {
            if($v >= $vn*$y) {
                echo $y;
                $set = true;
                $v -= ($vn*$y);
            }
        }
        if(!$set) { echo "0"; }
    }
    echo "\n";
}

while(true){
    $now = new DateTime();
    
    echo $now->format("h i s")."\n";
    
    echo "H:\t";o($now->format("h"));
    echo "M:\t";o($now->format("i"));
    echo "S:\t";o($now->format("s"));
    
    echo "\033[4A";
    usleep(500000);
}