Hi,
In my site, I made a post on 1th November, I cannot see it in november calendar, but I can see it on october. I think it could be because of that very week starts in October and not in november.
Anyway, I think that if a week spans between two months, the posts of two months should appear, if not, the first week always appears empty :-(
Another thing, while watching the tables I saw that when you change the date format the blog system stores the dates in the database differently, IMHO it should always store the full datetime and the presentation layer should display it differently, because if you change the setting you will not have all the info.
Another thing (the last) it seems that when saving the post some kind of timezone "offset" is applied, that is fine, but it seems it happens also when you edit the post, so you can see the post, edit it, and stop seeing the post because when saving it, the datetime has increased seven hours and it's tomorrow time.
Thanks
Enrique Blanco
www.eblanco.com