The button battery on my mother board died giving mme "CMOS date and time not set" message. I have changed the battery and using F10 on boot-up have successfully updated the correct time, month and year. However it will not let me update the correct day (17). The highest number it will accept is 12.
That probably means the date is in a different format than what you think. Typically users in USA list date as DD/MM/YYYY. I suspect it has the date in a different format. Since you are in Windows 10, right click the time and date icon. Pick "Adjust date/time. When the page comes up, you will see a place to change the format or just set it to auto in the first setting at the top.
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