For anyone else wanting to find a temporary solution right now, you could get a unix timestamp (for example, from here https://www.unixtimestamp.com/) and then use it in this url:
https://cohost.org/rc/tagged/[tag]?refTimestamp=[timestamp]000
Make sure to replace [tag] with the tag you are searching and [timestamp] with the unix timestamp. You will also want to make it be a little after the time of the post, as you won't be able to see posts after the inputted time.
JackDotJS
Something similar to Tumblr's archive view, where posts are categorized by month and year. Allows you to more easily find old posts on a page (or tag search!) without having to continuously click the next page button hundreds of times over.
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