Not exactly wizard code, but why not publish it anyway... I googled for an example like this myself but had trouble finding a good match. Maybe it was more a question of finding the right keywords to search for.
I use this code on the Swedish site for the World Usability Day.
function daystogo() { // my target date is November 14th 2006 $then = mktime(0, 0, 0, 11, 14, 2006); // calculate difference between now and then $now = time(); $diff = $then - $now; // second, minute, hour $days = round(0.5 + $diff / 60 / 60 / 24); // make sure we do not return negative zeros if ($days == -0) $days = 0; return $days; } // somewhere later in the code... $days = daystogo(); // if ($days > 0) ...