01-13-2010
Maybe this helps:
Quote:
Every clock has a value that differs from 'real time'. A quartz based eletronic clock keeps imperfect time, but maintains a very consistent inaccuracy. This base 'inaccuracy' is known as 'time skew' or 'time drift'. Each time the clock is set with hwclock (e.g. during shutdown), hwclock calculates the difference between the new value and previous values and calculates a mean difference. This difference is recorded in the file /var/lib/hwclock/adjtime and in an hourly cron job. Arch Linux adjusts the hardware clock according to the recorded drift. If you are seeing large changes to your hardware clock, it is likely because a large drift is recorded in /var/lib/hwclock/adjtime. This can happen if you have set the hardware clock time incorrectly, or your time standard is not syncronized with a Windows or Mac OS install. To fix this remove /var/lib/hwclock/adjtime, set the correct hardware clock and system clock time, and check if your time standard is correct.
source:
Time - ArchWiki
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