A small PHP script for converting SOL (Mars days) into Earth days

sol.php

<?php
/**
 * Usage: php sol.php <amount of sols>
 *
 */

date_default_timezone_set('UTC');

define('DAY_MARS', 3600 * 24 + 39 * 60 + 35); // 24h 39m 35s
define('DAY_EARTH', 3600 * 24);

define('SOL_QUOTA', DAY_MARS / DAY_EARTH);


$sol = max(1, (isset($argv, $argv[1])) ? (int)$argv[1] : 1);
echo 'SOL: ', $sol, PHP_EOL;

$days = $sol * SOL_QUOTA;
echo 'Days: ', round($days, 3)	, PHP_EOL;

if ($days > 30) {
    echo 'Month(s): ', round($days / 30, 2), PHP_EOL;
}
if ($days > 365) {
    echo 'Year(s): ', round($days / 365, 2), PHP_EOL;
}