Google Advanced Search page has recently added the new parameters of dates under a drop down list format prior to this they had the option to choose dates on quarterly basis for ex. 3, 6, 9, 12.Now you can search on the hourly basis, Even you can define your own time format also

Here is the quick cheat sheet:

d[number] – past number of days (e.g.: d10)

w[number] – past number of weeks

y[number] – past number of years

This is very useful for the webmasters and seo’s who want to see all new pages recently added to the Googles Database.