找到extend.func.php添加自定义函数：
 
function shownewimg($pubtime)
{
$ntime = time();
$tagtime = $pubtime;
$day3 = 3600 * 24 * 30;
if($tagtime > $ntime-$day3) $pubtime = "<img src='images/new.gif' />";
else $pubtime = "";
return $pubtime;
}
 
在模板文件中添加
[field:pubdate function='shownewimg(@me)'/]