- time: documentation ( source)
- mktime: documentation ( source)
<?php
$target_days = mktime(0,0,0,12,31,2013);// modify the birth day 12/31/2013
$today = time();
$diff_days = ($target_days - $today);
$days = (int)($diff_days/86400);
print "Days till next birthday: $days days!";
?>
- See more at: http://www.w3resource.com/php-exercises/php-date-exercises.php#sthash.xJA52BEw.dpuf