具体实现代码如下：

date_default_timezone_set("etc/gmt-8");
header("Content-type: text/html; charset=utf-8");
class calendar{
var $t = array();
var $datesofmonth = array('1'=>'31','2'=>'28','3'=>'31','4'=>'30','5'=>'31','6'=>'30','7'=>'31','8'=>'31','9'=>'30','10'=>'31','11'=>'30','12'=>'31');
var $y,$m,$d;
function set($time){
$this->t = getdate($time);
$this->y = $this->t['year'];
$this->m = $this->t['mon'];
$this->d = date('d',$time);
}
function isrun(){
return ($this->y%400==0 || ($this->y%4==0 && $this->y%100==0)) ? 1 : 0;
}
function first(){
$time = mktime(0,0,0,$this->m,1,$this->y);
$time = getdate($time);
return $time['wday'];
}
function html(){
$isrun = $this->isrun();
$this->datesofmonth[2] = $isrun==1 ? 29: 28;
$html .= "