The G-Shock DW6900FS-8 is a digital wristwatch manufactured by Casio. The watch is capable of displaying the time in both 12 and 24 hour format on its LCD display, depending on your personal preference. Switching from 24 hour to 12 hour time stops times like 14:00 appearing on the display; the watch instead uses an AM/PM indicator to the left of the hour number. Your watch may have been set to the 24 hour format by default or accident. Changing it to 12 hour time takes a few seconds.

Tap the button on the bottom left corner of your G-Shock watch until the current time appears.

Press the button in the top left corner of your watch. The seconds begin flashing.

Press the large square button directly beneath the display. The watch switches from 24 to 12 hour time.

Push the button on the top left of your watch a second time. The display returns to normal, showing the 12 hour time.