“Macbook air 2020 date and time lose
Hi, my macbook air lose date and time randomly even is on battery or plugged in , if is not used for few hour it remain at the time that it was used last. If i use it the battery last normally so i don’t suspect is bad battery.”
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Avoiding Changing Mac Date and Time:
Reinstall the macOS:
Nothing would be deleted. It's just that items that have become corrupted or deleted, would be replaced or reinstalled back to where they should be, respectively. Go Here: How to Reinstall macOS from macOS Recovery - Apple Support
Important: Be certain to create a backup of your Mac prior to all of this. That way, you can have something to restore from the Mac from, should anything go wrong with the reinstall.