Depends on your use of watches and the environment you tend to be in. If you are somewhere that allows you to see whether there it is day or night, than using 12 hr setting will work just fine. However if you're in a place that keeps you secluded and you are not able to determine whether it is day or night than 24 hr. setting will help you keep track of not just the time, but whether it is day or night.
SOURCE: How do I set the 12 or 24 hrs setting on my Casio DW 9052 casio?
when you are setting the time just hit the (g) or light button and it will switch it to 2400 time.
SOURCE: how to set time Casio W-89H two button watch
Actually, the watch has 3 buttons -- "Light" being the 3rd one. Press Mode until a number in the time mode begins flashing. Then press the Light button to get it to the hour indicator. Use the 12-24 Hr button to set it to the current hour. Then press the Light button again to get it to the minutes section. Again, use the 12-24 Hr. Button to set it to the next minute coming up in the current time. Then push the Light button again. This will bring up the seconds indicator. At the precise time the minute you set before begins, hit the 12-24 Hr. button, and the indicator goes back to zero and begins ticing away. Then hit the Mode button again until the watch is in the current time mode. Hope this helps. I use Internet time to set a precise time.
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