It sets itself automatically. the watch is radio atomic.
Source: I own one.
hold down the adjust (set) button until the time starts to BLINK and then clivk the buttons on the left side of the watch to set the time. after you have done this, you must hold down the adjust button once more until the time STOPS blinking
G shock
You need to hold it sideways and push all four buttons. You need to hold the buttons for 1 minute...this will reset the time and the 24hr clock, the hypergear can then engage the analog fluxcopaciter and whala your watch is perfect!
download manual from casio
How to change my G shock watch am or pm
Instructions
To change the time in a G Shock watch, first press the "adjust" button. You can then choose the number that you want to change, whether it be the hour, minute, or second.
To change the analog time on your G-Shock watch, first, pull the crown or adjustment knob out to the second click position. Turn the crown to set the hour and minute hands to the desired time. Once adjusted, push the crown back in to the normal position to complete the setting. Always ensure that the watch is in the correct mode before making adjustments.
To set the day on a G-Shock watch, first, pull the crown out to the second position. Then, turn the crown to adjust the time until the desired day appears in the display. Once set, push the crown back in to finalize the setting. Remember to ensure the AM/PM indicator is correct, as it can affect the day setting.
Red Casio g shock season 1 Purple Casio g shock season 2
DW6900MS1 is the specific model number of your G-Shock watch.
you just do mode adjust and then it is set