$year = 1945; //год создания сайта
$month = 12; //месяц
$days = 9; //день
$seconds = time() - mktime(0, 0, 0, $month, $days, $year);
$d = 60*60*24*365.4;
$year = (int)($seconds/$d);
$seconds = $seconds - $year*$d;
$d = 60*60*24*30.4;
$month = (int)($seconds/$d);
$seconds = $seconds - $month*$d;
$d = 60*60*24;
$day = (int)($seconds/$d);
$week = (int)($day/7);
$day = $day - $week*7;
echo "$year л., $month м., $week н. и $day дн.";
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