I sympathize, it took me ages to work this out - I had the same problem having had the battery replaced in my watch which only lasted 18 months...the irony was that my previous watch was still working & set to the correct, time date etc!
The following instructions are for the Casio Wave Ceptor 4757 WVQ-142E, the official Casio instructions are available at the following:
For the extra information Casio neglect to tell you in the manual, read the following:
First, the watch needs resetting. To do this you need a watchmaker's screwdriver, remove the back (4 screws - obviously, you do this at your own risk), remove the thin plastic cover to reveal the battery.
On my watch on the battery cover it says to reset the watch, get a pair of tweezers & connect the battery back to the negative (marked -) plate for about 2 seconds, thus forming a circuit.
The watch stops, the screen goes blank for about 30 seconds, replace the plastic cover , back & screws.
Wait until the watch has picked up the correct time signal, the digital part will show the correct local time, the analogue screen won't at this stage.
Set the watch to the desired time zone that you require or HS (Home Setting).
Then press button "C" (bottom left) to scroll through until "HS" is displayed on the screen, then press button B (top right) for about 5 seconds until it flashes "OO" in the screen, then press the A (top left) button down & to reset the analogue time (so all 3 hands are pointing up) to 12 O'clock, it has to be set to 12 so the watch will recalibrate itself, if it is not set to 12 O'clock, it won't work!
- sadly Casio don't tell you this bit in the manual....& of course this is really obvious to us mere mortals!
Now that you have aching hands & repetitive strain injury, press the B button (top left) to exit the (watch) hand setting mode & the watch will now wind the hands by itself to the correct analogue time, (or in theory it will, it took three attempts to set my watch).
Yes, for the record Mr Casio, if you hand a watch to someone & tell them to set it to the correct time, they will set it to the current local time (assuming that it is not 12 O'clock) & as opposed to 12 O'clock by default!
This is not rocket science, if your company is able to make & market a radio controlled watch which is in theory accurate to one second in a million years because it is controlled by the Rugby atomic clock, you'd think that the instruction department could write some decent instructions!
Hopefully this solved the problem!