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An example for G-shock: I searched for casio g-shock manual and got this: http://world.casio.com/wat/download/en/manual/
You enter model from back of watch and it gives you a searchable PDF manual.
For mine, model 2638 (and likely most G-shocks), you press and hold the upper left (Adjust) button until the City Code flashes. You then press the lower left (Mode) to enter DST mode then press the lower right (Receive) as it cycles through On, Off and Auto. On moves 1 hour forward, Off moves 1 hour back. After you select, you press the upper left button (Adjust) twice and it's set. I would not pick Auto anymore as my watch is still set to the original DST days which were changed in the US years ago and no longer match, I don't believe the DST days used can be changed by the user and I don't believe Auto receive adjusts for DST.
I have a different model of Casio but I suspect that the operation is the same.
To change DST you should press the button (8 O'clock) to give world time. This should be showing your city.
You should then use the button you mention to toggle between DST & ST. (ST is no DST display!).
If this does not work and you wish to read through instructions for your particular model, then go to casio.com, select "support", and under "technical support" select "manuals", then "watches", agree terms, and the select "watch manuals archive", insert the required number off the back of your watch and download the instructions.
go to www.casio.co.uk go to support(methinks??) click on watches and put in the model number (the one you posted) and download the PDF manual relating to your watch (you will need adobe reader free download to read PDFs), this will be the full manual, once you figure it out DST will have to be on, as its summertime of course. ( i bought a wave ceptor for a fiver because the guy who had it didnt know how to recalibrate it after a battery change), a quick gander at the online manual put it right, there shouldnt be a problem setting it up again, good luck
I had the same problem following recent daylight savings time (DST) change. The watch has three DST mode settings (ON, OFF, and AUTO). You get to the setting mode by pressing and holding the "adjust' button until the city time zone indicator starts to flash. Then press the "mode" button. This should give you the DST setting. Now press the "receive" button to cycle through the ON, OFF, and AUTO modes for DST. I set it for AUTO. I then existed the setting mode by pressing "adjust" again.
Now you can initiate a manual update of the time by pressing and holding the receive button. Put your watch by a window and make sure the signal strength indication is showing level 4 (full picture of satellite dish on my version). Give it a few minutes to down load new time.
After doing this the watch corrected itself and now shows correct time. Other wise I assume you could set the DST function to ON or OFF as well depending on whether you need to add or subtract the hour from the time.