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This points to an issue with what component when getting home from the office, to help prepare you for the new CompTIA A+ exam, you determine to play around with your computer settings before dinner. You notice that date and time settings are all wrong whiles inside the BIOS, although you have just set them last night.

A CMOS battery

with the CMOS battery, usually has issues with incorrect BIOS date and time settings. even when the PC loses power after you shut it down, this is used to keep the settings intact within the BIOS