I’ve worked with Microsoft products since MS-DOS days and I have played with Time itself.
My last computer I fucked up the time on it permanently.
I was bored and wanted to mess with Internet Time as it’s one of the least secure and yet most important parts of a computer system; NTP as a protocol is ANCIENT and hasn’t changed; it goes back to the days when only universities and militaries used the internet and so TRUST was automatically built into the system.
[yes, military and university systems are NOT security minded by default because they are INTERNAL – I’m sure military folk in here will confirm]
So I downloaded some NTP stuff on my computer and started messing around to see if I could get nearby beacons to shift time by a bit.
and I think it worked – for about 15 minutes. But after that, I could no longer update my computer’s time automatically where it would “stick” – it could update the time correctly at first, but within 15 minutes it would go to being about 3 hours and 47 minutes BEHIND and it stayed that way for about 5 years; it’s still that way if I turned it on.
Anyway, manipulation is certainly possible by people smarter than me and there’s lots. System time change is reflected in the windows log (I referenced the code in an earlier comment) but deleting that out of a log or clearing it isn’t even hard; people do it all the time because security logs are BIG text files that take up a lot of room and people delete them regularly to make room