Hi eddiepaul,
This watch is fairly complex, with all the many features and modes. I could list this procedure out here, taking up an entire page, but I will say you start by pressing button "D" on the lower left, one time. Setting the time is the first of 6 (Six) modes of operation. Your watch module number is probably a #2632, and module #2805 is basically the same.
If you don't have the manual, go here and download, save and printout the manual for complete instructions for everything about this watch.
http://ftp.casio.co.jp/pub/world_manual/wat/en/qw2632.pdf
You'll find what you need for setting the date and time on page 1.
It's hard to believe Casio packed so many features in such a reasonably price watch! I've had Casio and Timex with all these modes, and love 'em!
Let me know if I can be of further assistance.
Regards, Bill