我使用这段php代码来显示Gig列表，这是一种自定义的post类型。我想按帖子的“时间”值排序，并忽略已经发生的演出。如何修改以下代码来实现这一点？

    <?php
$args2 = array(

    \'post_type\' => \'gig\',
    \'numberposts\' => -1
);
$gigs = get_posts($args2);
foreach ($gigs as $gig){
    echo \'<h2>\'.$gig->post_title.\'</h2><br />\';
    // for each custom fields you want.
    echo get_post_meta($gig->ID,\'_gigswhen\', true).\'</br>\';
    echo \'Time: \'.get_post_meta($gig->ID,\'_gigsstart_time\', true).\'-\'.get_post_meta($gig->ID,\'_gigsend_time\', true).\'<br />\';
}
?>

为了澄清一点，这里是我函数中的代码。php

    $config = array(
        \'id\' => \'gigs-info\',
        \'title\' => \'Gig Info\',
        \'pages\' => array(\'gig\'),
        \'context\' => \'normal\', 
        \'priority\' => \'high\', 
        \'fields\' => array(), 
        \'local_images\' => false,
        \'use_with_theme\' => true //change path if used with theme set to true, false for a plugin or anything else for a custom path(default false).
    );
    $my_meta = new AT_Meta_Box($config);

    //Add fields to your meta box
    $my_meta->addText($prefix.\'where\',array(\'name\'=> \'Where is the Gig \'));
    $my_meta->addDate($prefix.\'when\',array(\'name\'=> \'When is the Gig \'));
    $my_meta->addTime($prefix.\'start_time\',array(\'name\'=> \'When Does it Start \'));
    $my_meta->addTime($prefix.\'end_time\',array(\'name\'=> \'When Does it End \'));
    $my_meta->addText($prefix.\'with_who\',array(\'name\'=> \'With Who is the Gig \'));
    $my_meta->addTextarea($prefix.\'words\',array(\'name\'=> \'A few words on the gig \'));
    $my_meta->Finish();
}
?>

我使用的是一个定制的meta-box类文件，有人友好地指出了我。所以我不确定它是否保存为unix时间戳。。我对wordpress php编程有点陌生：）