Set up and watch is on 24 hour time instead of 12 hour time

google it and find out

Hi.
I take it that your watch changes date at 12 noon, instead of 12 midnight.
If so change the time of your watch 12 hours, so it reads the same time, but instead of am, it is pm, or visa versa. Analog watches do not have a 24 hour time setting.

1. Press the "MODE" button---usually on the lower left side of the watch, but sometimes on the right center side---to cycle through to the time display.
   

2. Press and hold the "SET" button---usually on the right lower side of the watch---until the seconds flash.
   

3. Press "MODE" repeatedly to cycle through the displays that flash: from hours to minutes to month to date and day. At the end of the cycle is the hour display option. Make this option flash.
   

4. Press the "SPLIT/RESET" button below the face of the watch to change the hour display option to "24-hour display." This is the same as military time. If there is a "NEXT" button on the upper-right side of the watch, use this to advance to the 24-hour option instead of using the "SPLIT/RESET" button. You may need to press a "START/SPLIT" button instead a "SPLIT/RESET" button to cycle between 12- and 24-hour display. The "START/SPLIT" button could be located below the watch face or on the upper-right side of the watch, depending on the model.
   

5. Press the "SET" button again. You are now done. All PM hours should be displaying hours between 12 and 23.
   

1. Press the "MODE" button---usually on the lower left side of the watch, but sometimes on the right center side---to cycle through to the time display.
   
2. Press and hold the "SET" button---usually on the right lower side of the watch---until the seconds flash.
   
3. Press "MODE" repeatedly to cycle through the displays that flash: from hours to minutes to month to date and day. At the end of the cycle is the hour display option. Make this option flash.
   
4. Press the "SPLIT/RESET" button below the face of the watch to change the hour display option to "24-hour display." This is the same as military time. If there is a "NEXT" button on the upper-right side of the watch, use this to advance to the 24-hour option instead of using the "SPLIT/RESET" button. You may need to press a "START/SPLIT" button instead a "SPLIT/RESET" button to cycle between 12- and 24-hour display. The "START/SPLIT" button could be located below the watch face or on the upper-right side of the watch, depending on the model.
   
5. Press the "SET" button again. You are now done. All PM hours should be displaying hours between 12 and 23.
   

1. Press the "MODE" button---usually on the lower left side of the watch, but sometimes on the right center side---to cycle through to the time display.
   
2. Press and hold the "SET" button---usually on the right lower side of the watch---until the seconds flash.
   
3. Press "MODE" repeatedly to cycle through the displays that flash: from hours to minutes to month to date and day. At the end of the cycle is the hour display option. Make this option flash.
   
4. Press the "SPLIT/RESET" button below the face of the watch to change the hour display option to "24-hour display." This is the same as military time. If there is a "NEXT" button on the upper-right side of the watch, use this to advance to the 24-hour option instead of using the "SPLIT/RESET" button. You may need to press a "START/SPLIT" button instead a "SPLIT/RESET" button to cycle between 12- and 24-hour display. The "START/SPLIT" button could be located below the watch face or on the upper-right side of the watch, depending on the model.
   
5. Press the "SET" button again. You are now done. All PM hours should be displaying hours between 12 and 23.
   

Best regards. Jewel

Thank you for contacting FixYa.<br /> <ol id="ecxintelliTxt"> <li id="ecxjsArticleStep1"> Press the "MODE" button---usually on the lower left side of the watch, but sometimes on the right center side---to cycle through to the time display.<br /></li> <li id="ecxjsArticleStep2"> Press and hold the "SET" button---usually on the right lower side of the watch---until the seconds flash.<br /></li> <li id="ecxjsArticleStep3"> Press "MODE" repeatedly to cycle through the displays that flash: from hours to minutes to month to date and day. At the end of the cycle is the hour display option. Make this option flash.<br /></li> <li id="ecxjsArticleStep4"> Press the "SPLIT/RESET" button below the face of the watch to change the hour display option to "24-hour display." This is the same as military time. If there is a "NEXT" button on the upper-right side of the watch, use this to advance to the 24-hour option instead of using the "SPLIT/RESET" button. You may need to press a "START/SPLIT" button instead a "SPLIT/RESET" button to cycle between 12- and 24-hour display. The "START/SPLIT" button could be located below the watch face or on the upper-right side of the watch, depending on the model.<br /></li> <li id="ecxjsArticleStep5"> Press the "SET" button again. You are now done. All PM hours should be displaying hours between 12 and 23.<br /></li></ol> Contact TIMEX for further assistance at:<br /> http://www.timex.com/info/Product_Instruction_Guides_Downloads

These basic instructions are for most digital watches (and these are for regular to military but you can just follow same instructions to get to oposite) Hope this helps!

1. Press the "MODE" button---usually on the lower left side of the watch, but sometimes on the right center side---to cycle through to the time display.
   
2. Press and hold the "SET" button---usually on the right lower side of the watch---until the seconds flash.
   
3. Press "MODE" repeatedly to cycle through the displays that flash: from hours to minutes to month to date and day. At the end of the cycle is the hour display option. Make this option flash.
   
4. Press the "SPLIT/RESET" button below the face of the watch to change the hour display option to "24-hour display." This is the same as military time. If there is a "NEXT" button on the upper-right side of the watch, use this to advance to the 24-hour option instead of using the "SPLIT/RESET" button. You may need to press a "START/SPLIT" button instead a "SPLIT/RESET" button to cycle between 12- and 24-hour display. The "START/SPLIT" button could be located below the watch face or on the upper-right side of the watch, depending on the model.
   
5. Press the "SET" button again. You are now done. All PM hours should be displaying hours between 12 and 23.
   

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Press the "MODE" button---usually on the lower left side of the watch, but sometimes on the right center side---to cycle through to the time display.

Step 2 Press and hold the "SET" button---usually on the right lower side of the watch---until the seconds flash.

Step 3 Press "MODE" repeatedly to cycle through the displays that flash: from hours to minutes to month to date and day. At the end of the cycle is the hour display option. Make this option flash.

Step 4 Press the "SPLIT/RESET" button below the face of the watch to change the hour display option to "24-hour display." This is the same as military time. If there is a "NEXT" button on the upper-right side of the watch, use this to advance to the 24-hour option instead of using the "SPLIT/RESET" button. You may need to press a "START/SPLIT" button instead a "SPLIT/RESET" button to cycle between 12- and 24-hour display. The "START/SPLIT" button could be located below the watch face or on the upper-right side of the watch, depending on the model.

Step 5 Press the "SET" button again. You are now done. All PM hours should be displaying hours between 12 and 23.

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.

press mode button 3 times untill you get into the time set mode - press lap/reset twice until the hours start to blink.

press start/stop and cycle thru all the modes depending what time you want to set - it will go thru 1, 2, 3, etc thru 24 H then 1, 2, 3, etc thru 12 A then 1, 2, 3, etc thru 12 P - depending on thte time you want to set the A is for AM and the P is for PM

hope this helps

jeff