This is oversight from time when KStars was only planetarium so you wanted to have clock with ability to go forward and backward. For some reason they keep using this simulated clock withing Ekos too. Probably because it give you ability to run automatic tests where you can set predetermined date and time and run some sequence.
I started to work on option that will lock KStars clock to system clock. So if you set NTP or GPS synchronisation you should never see this issue again.
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How fast this drift happens? I looked at code and there SimClock class that seems to handle timekeeping. It use monotonic clock which means when it start it make store current time as startTime and how many milliseconds that monotonic clock show. Then it return time as startTime + elapsedTime from monotonic clock. As far I can tell there should be no accumulation error. Monotonic clock are not affected by change of system time. That mean KStars doesn't reflect on change of system clock.
So only disrepancy between KStars time and real time should come from drift in that monotonic clock. I wrote simple testing program that output difference between monotonic and system clock. Monotonic clock is running 10ms/hour faster than system clock.
Also I let run KStars for few hours and didn't observe any drift between kstars clock and system clock. So that 18 hours drift most likely mean some faulty hardware clock. Because 18 hours drift even over one month period means it drift 90 second per hour. I am pretty sure someone would notice such huge drift.
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That link is bit outdated. It just that libraries and compiler is now too old to be able to compile latest KStars. So upgrade to 22.04 or wait a bit and upgrade stright to 24.04 that should be released in a week or so.
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Just checked my archive. I have around 9000 files that have correct 2880 size multiple and 987 that are not. All bad ones were produced around august - september 2022.
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Tried this with simulator but I can't reproduce it. My FITS file is multiple of 2880 and I can see zero padding at end of the file.
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