php – 向Google日历添加活动时的时差

问题是,当我尝试添加事件时,存在时差问题.

例如,如果我将以下内容添加到日历03/21/2012上午8:00,则在Web上查看的日历条目中的时间将设置为17:30.

这是我的代码：

$gmail = 'mail@gmail.com';
$gpwd = '1233';
$datetime1 = strtotime('03/21/2012 8:00AM');
$date1 = date("Y-m-d",$datetime1);
$idg = add_to_calendernow1($gmail,$gpwd,$id,$date1,$datetime1);

function add_to_calendernow1($gmail,$ticket,$date,$timestamp){
    if($gmail){
        /* Change the below path with correct path class1.php and class2.php are in the includes directory */
        include('includes/class1.php');
        include('includes/class2.php');
        $email = $gmail;  
        $password = $gpwd;  
        $altEmail = $gmail; 
        $login = new GoogleClientLogin($email,$password,GoogleClientLogin::$CALENDAR_SERVICE,APP_NAME);  
        $cal = new GoogleCalendar($login);
        $cal->altEmail = $altEmail; 
        $content = "Ticket #".$ticket." scheduled now";
        $entryData = $cal->addEvent(array(  
                        "title"=> "Ticket #".$ticket." Scehduled An Item","content"=> $content,"where"=> "","startTime"=> $timestamp,"endTime"=> $timestamp
                    ));  
        $id_now = explode('feeds/',$entryData['id']);
        $sec_id = $id_now[1];
        $id_id = explode('/',$sec_id);
        return $id_id[0];
    } 
}

GoogleClientLogin和GoogleCalendar课程来自此博文：

http://mark.biek.org/blog/2010/07/addingdeleting-events-with-the-google-calendar-api/

有没有人对可能导致这种情况的原因有任何想法？

Google日历的时区设置为东部标准时间,服务器位于美国.

我的代码中是否还需要做其他事情以确保时间得到正确执行？