TL;DR version: Use the search box to do a search, e.g., @realdonaldtrump. On the left side of the search results, you'll see some search options. At the bottom of the search options you'll see "Advanced Search" in bold. Click that to be able to search by date.
Supposedly only works if you're logged in.
ThanQ - I’ve considered being logged in might be a requirement & I’m guessing that’s what it was - but I will try again (though still not logging in! LDR found that can be interesting! “Q” said they could hear her breathing! hehe)