I don't know if this is related to the other date issue, but I've noticed that the calendar on the right side of the page on http://www.geocaching.com/my/geocaches.aspx (ie. Home > My Details > Geocaches Owned/Found) is missing some links to days that I have cached. For instance, in my case, there is no link to Tues, Nov. 13:
java script:__doPostBack('MyCalendar','2873')
I don't use that calendar much, but I do glance at it every once in a while to see how obsessed I've been with caching.. so it'd be nice to have complete information