discuz时间更新

论坛根目录下misc.php文件下面的代码，418行开始：
$query = $db->query("SELECT extcredits, SUM(ABS(score)) AS todayrate FROM {$tablepre}ratelog
WHERE uid='$discuz_uid' AND dateline>=$timestamp-86400
GROUP BY extcredits");

修改为

$todaystamp = strtotime(gmdate('Y-m-d', $timestamp));
$query = $db->query("SELECT extcredits, SUM(ABS(score)) AS todayrate FROM {$tablepre}ratelog
WHERE uid='$discuz_uid' AND dateline>=$todaystamp-86400
GROUP BY extcredits");

新修改的代码将原来的$timestamp（当前时间）改成自定义的$todaystamp，当日0时时间。

这个貌似不能这样判断吧,各个地方的时间不是一样的啊!你怎么判断呢?
还是24小时比较现实吧,