This is the code used inside of the old Google search:
"GET https://vanced-youtube.neocities.org/2012-searchresults.html?sclient=psy&hl=en&site=&source=hp&q={searchTerms}&btnG=Search
UTF-8"


Did you see the part that says "2012"? You can change it to any of these years:
1998, 2000, 2001, 2002, 2010, 2012, 2013, 2015