<?//Two built in functions - date() time()
date_default_timezone_set('Europe/London');

$today = date('dS M Y H:i:s T');
echo $today."<br><br>";

$now = time();//seconds since 1st January 1970 (UNIX timestamp)

//Countdown to Christmas
$christmas = 1640390401;

$interval = $christmas - $now;
$days = $interval/60/60/24; //convert to days

echo "Days to Christmas: ".floor($days);  // floor() ceil() round()

//Days to graduation = July 14th 2023
$graduation = 1689343201;

$timeUntilGrad = $graduation - $now;
$daysToGrad = $timeUntilGrad/60/60/24;
echo "<br>Days to graduation: ".floor($daysToGrad);

?>