Full Jalali calendar support for WordPress and localization improvements for Persian/Afghan/Tajik users.
This plugin is just able to work on hacked wordpress packages by plugin authors, most of themes and plugins like buddypress or bbpress are out of its range.
My website language is Farsi but the post dates appear Gregorian.
All Archive, Calendar and Admin Panel dates work just fine. But the date stamp on published posts stays Gregorian (Which is a crucial part for websites that want to look Farsi!)