I must apologize for thinking that Google, which seems to have forgotten about the concept of search, would offer a way for Gemini users to search through their chats by date. This seems like a very simple feature that at least a few more than myself would be interested in using, but after some trial and error with Gemini (Argon!) it seems there is no way to filter Gemini chat history by date. More generally the search functionality is restricted to keyword search.

My conspiracy theory is Google's search people are boycotting any contribution to Gemini products. Only half kidding.