Other versions of WP themes I’ve seen/used have a calendar in the “Archive” section (in this template/theme, over on the right). You can click a day and get all the articles posted that day.

It wasn’t in this “Wordpress Classic” theme that came with Wordpress 1.5. But looking at the code in another theme, I found the key PHP line [get_calendar()] and dropping that between appropriate LI and PHP tags did the job. I suppose I should check the developers documentation at codex.php.org, but that seems like too much work at this point.

[This is the second try to post this info. I may have fumbled something earlier …]