Gregarius does not take rss.config.tzoffset into account when grouping items by date. (Even using the default theme).
For example suppose an item has April 6th 2006 as the date, and we change rss.config.tzoffset enough so that the time difference goes past midnight and forces the date to change to April 5th, 2005. Then, although gregarius shows the correct time, it shows the wrong date everywhere. if you look at the permalink url of this item two things happen.
a). The url is incorrect. http://example.com/gregarius/2006/04/06/ instead of http://example.com/gregarius/2006/04/05/
b) The item says it was posted on April 6th instead of april 5th.
