It sounds like your watch is set to the wrong time zone. If you haven't got instructions, you can get them from their web site.
You can get instructions from the Casio web site.
Go to the casio web site "casio.com".
Select "support" and the "manuals",
watches;
Accept terms
Select "watch manual archive"
Read the number of the back of your watch and enter it into the search box
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