Help!

Can any of my readers help me? I cannot figure out how to set the date and timestamp on my postings. It is now 02h43CST 20 December 2005 and my posts are still being dated 19 December! One reader was kind enough to tell me that there is an arrow/button somewhere to change the stamp, but I can't find it. My computer clock works, I've shut and reopened the browser, but nothing seems to work. Do any readers who use Blogger have any advice? I'd like to start posting the Almanac again, but I want it at the top of each day's postings and ntil I figure this problem out, I can't do that. Thanks.