Google Operating System reveals a way to expand your date specific search beyond what Google has available on Google’s advanced search page.
The date feature gives you a pull down to choose past day, week, month, 2 months, 3 months, 6 months or 12 months. But what if you want to see the past 3 days or the past 10 days?
As you can see by the URL string for the past day, it adds the =d parameter to the URL. So a search for new indexed pages by Google for my site would use this URL: http://www.google.com/search?q=site:seroundtable.com&as_qdr=d. To modify that to 3 days, you add a 3 after the “d.” For example, you would search for http://www.google.com/search?q=site:seroundtable.com&as_qdr=d3.
You can see that Google adds “past 3 days” to the search bar, after adding that parameter.
Ionut explains in his post the following parameters all work:
d[number] – past number of days (e.g.: d10)
w[number] – past number of weeks
y[number] – past number of years
These features are very useful for searchers and webmasters.