从纳兰映像看来的，首先设置输入一个检索词，然后在搜索结果的url后边加上 &as_qdr=d，敲回车即可，看看有什么新变化。
在TC上找到了纳兰依据的版本 Michael Arrington：
One of the more useful Google advanced search features is the date filter, which limits results to recent pages. Results can be limited to the past day, week, month, year, etc. Google’s Matt Cutts and GoogleOperatingSystem wrote about it late last year.
You can access the search via the URL as well, by simply adding “&as_qdr=d” to the end of any query (Apple v. Apple in last day). simply change the =d to d5 for 5 days, or w5 for five weeks, or y5 for 5 years, etc. With Google indexing sites so regularly now, it would be great if they let users refine searches down to the hour as well.
GoogleOperatingSystem上给出个更一般的形式：
The nice thing is that you can change the value of as_qdr to custom intervals. Here are all the possible values of the as_qdr parameter:
d[number] – past number of days (e.g.: d10)
w[number] – past number of weeks
y[number] – past number of years
google搜索结果按时间排序的一般形式：&as_qdr=d#/w#/y# #表数字
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