When I added the widget to my sidebar it breaks my theme, page and displays this at the bottom of the page:
Fatal error: Call to undefined function date_timestamp_get() in /xxxx/xxxx/public_html/xxx/wp-content/plugins/folding-archives/index.php on line 35
(I've obviously removed my server/folder names, replaced with "xxxx")
If I remove the Folding Archives from the sidebar, the problem goes away. Seems like a neat plugin and I'd like to use it, if this issue can be resolved.