Does the casio LA670 have a 24 hour time setting?

Question edited for a little more clarity.

This is one of those watched with multiple dials and dozens of functions. It sounds like there is an hourly repeating alarm at 10 minutes to the hour. All time zones are synchronised to the top of the hour. The best thing to do is remove the batteries for 2 minutes and replace them. Then set the time again.

https://www.google.com/search?q=Casio+AE-1200whb-3bvdf+watch+manual

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Try this:-

First set the watch to 24 hour format rather than 12 hour format.

http://support.casio.com/storage/en/manual/pdf/EN/009/qw3225.pdf

If your watch is exactly an hour out, then you need to set the daylight saving time (DST) via the mode button.

If this is not the case, then I cannot help you.

~Good luck

mcdevito75 here, Many Casio Watch Models out there, I'll bet however your Casio is displaying say 1 AM rather than 1 PM as it should if the time is indeed PM after 12 noon, if so, this is why the date is changeing at 12 PM rather than, 12 AM simply re-set your casio and make sure the time of day is set at PM for time after 12 noon and AM for time anywhere before 12 NOON. Also, as you set your Casio, look for anything that may give the hint of Military time, this may be revilled as 12 hours or 24 hours, if you have anything like this, make sure it's set for 24 hours. If you have additional problems, visit a small watch repair shop in your area. Again there are many, many Casio models out there and without your watch with me it's difficult to be more accurate.

On the Casio 2747 you can easily change between 12-hour and 24-hour (i.e. Military time)... Follow these steps:

1. Make sure you are in Timekeeping Mode (i.e. digital display shows date at the bottom).
2. Press the "D" button (i.e. bottom-right button) to toggle between 12-hour and 24-hour timekeeping.

Note: 12-hour timekeeping mode will display an "A" or "P" for AM and PM.

You need to manually adjust or set the hands to the home position as they are not where the watch thinks they should be. This can happen when you bring your watch close to a strong magnetic field. Look in the manual to do this. Afterwards your watch should set to the correct time.

Not a direct solution but you can get the electronic manual for free from http://world.casio.com/wat/download/en/manual/

Here is how you do it:

Looking at your watch face: the upper left button is A, upper right is B, lower left is C and lower right is D.

Get your watch into "Hand Setting mode" That is the mode witht he digital time and seconds above it.
From Day and Date window it would mean pushing button "C" six times to get to that mode.

Once in "Hand Setting Mode"
Hold down button "A" til time blinks, then press button "D" to advance the hands, to the desired time.

Press "A" to exit mode.

Press "C" to return to timekeeping mode.