How to add date filter to the google search result

launch google search

enter your keywords and press enter to get the results

edit the browser URL & add to the end

e.g.To limit the results to last 180 days

&as_qdr=d180

you get results such as below, notice the "Past 180 days" drop down

e.g. To limit the results to last 6 months

&as_qdr=m6

e.g. To limit the results to last 2 years

&as_qdr=y2