20 Most Recent Casio G-Shock Analog Digital Watch GA-150A-4A GA150A Questions & Answers


To set time and date, you must in "Time Keeping Mode" (display day, date & time) then press and hold the left-up button until it start flashing. To set press right-down button, to go next setting press left-down button.

To toggle between 12-hour to 24-hour, again, must in "Time Keeping Mode" then press right-down button.

here is the manual https://support.casio.com/storage/en/manual/pdf/EN/009/qw2672.pdf

Casio Watches | Answered on Aug 19, 2019


The format (12-hour and 24-hour) of the alarm time matches the format you select for normal timekeeping. When setting the alarm time using the 12-hour format, take care to set the time correctly as morning or afternoon.
https://support.casio.com/storage/en/manual/pdf/EN/009/qw5158.pdf

Casio Watches | Answered on Jul 09, 2019


To Toggle between 12-hour and 24-hour timekeeping:

In the Timekeeping Mode (regular watch display), press the lower right-hand button to toggle between 12 and 24 hour timekeeping.
12 24 toggle-2boiufb2ir3wdmt45g4ixcbm-5-0.png

Casio Watches | Answered on Jun 15, 2019


Please Google (casio)(EFA 124)(manual) without parens.

Casio Watches | Answered on May 31, 2019


you posted to USA web site that is only English, not obvious that?

Casio Watches | Answered on May 24, 2019

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