adjkerntz(8) on FreeBSD
The text dfd21dc3d2fe, as FreeBSD 5.5-RELEASE, FreeBSD 5.4-RELEASE, FreeBSD 5.3-RELEASE, FreeBSD 5.2.1-RELEASE, FreeBSD 5.2-RELEASE, FreeBSD 5.1-RELEASE, FreeBSD 5.0-RELEASE shipped it.
adjust local time CMOS clock to reflect time zone changes and keep current timezone offset for the kernel
Flags it lists
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-a -
-i