Can you tell me what character comes after 1 in:
Archives for: 1? 2008, 15
Is it a Taiwanese zero?

For testing purposes you change the Locale Date to something European / US, so Month Day Year. Do so in Global Settings -> regional.

If that doesn't help, you want your ddatabase setup as UTF-8. More information on that topic is here: [url=http://forums.b2evolution.net/viewtopic.php?t=13366&start=0&postdays=0&postorder=asc&highlight=]HOW-TO: Configure b2evolution for non-English posts[/url].

Good luck