Daylight savings time change casio atomic watch has not changed is there a way to change it manually

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.

Yes, you can use the mode button to reach the appropriate setting.

To get the details of how to do this, get a copy of the manual 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