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Save real-time clock on reboot
For computers without a real-time clock, this utility enables to store
the wall-clock on shutdown and restore it on boot, in order to minimize
the drift as far as possible until e.g. NTP is used to set the correct
date/time again.
Note that systems using UFS for the root fs won't need this, as the
clock is already restored from info in the UFS superblock.
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