Here is a link to the specs for that watch:
http://www.shopcoolstuff.com/detailItem.asp?id=378&CatId=31&pName=casio_edb610-1c-watch,-casio-edb610-1c-watch
And here is a direct link to the user's manual / operational guide for that model:
http://ftp.casio.co.jp/pub/world_manual/wat/en/qw2550.pdf
To view the Owner's Manual with Operating Instructions just use your mouse to click on the link, which is the underlined and highlighted text just above. This will open a new web browser page automatically for you and allow you to view the information at the website indicated and the contents of the Owner's Manual.
You may need ADOBE READER installed on your computer to read PDF documents.
You can download this free at
WWW.ADOBE.COM if necessary.
Click on the DOWNLOAD ADOBE READER button on right side of the ADOBE home page when you get there, the follow the onscreen instructions to install the software on your computer.
See page 2 of the manual for detailed instructions and illustrations on how to switch to daylight savings time.
Thank you very much and good luck.
Joe.