There's no such specific feature. Dang used to curate occasional best-of collections, but hasn't for a few years now AFAIU.

Algolia search will return results for a specific period of time.

This includes presets for the past week, month, or year. Alternatively you can define a specific timespan.

https://hn.algolia.com/?dateRange=pastYear&page=0&prefix=fal...

Here's 2021:

https://hn.algolia.com/?dateEnd=1640908800&dateRange=custom&...

Note that time is designated in seconds from epoch.

  https://hn.algolia.com/?dateEnd=1640908800&dateRange=custom&dateStart=1609459200sort=byPopularity&type=story

Thanks.

I am looking "user specific" by username

like in 2021 Your top post You up-voted N items etc

Submissions and commnents, yes:

https://hn.algolia.com/?dateRange=pastYear&page=0&prefix=fal...

https://hn.algolia.com/?dateRange=pastYear&page=0&prefix=fal...

Note that comments are not ranked by votes, as that information isn't exposed by the API any more (AFAIU).

Your own upvotes wouldn't be available except to you. You can see your upvoted posts / comments over time from your user page, however.

https://news.ycombinator.com/user?id=motyar

(Other users cannot see this information.)