When using ntpdate to set the time/date on an Alpha, ntpdate gives the message Can't adjust the time of day: Invalid argument when it finds a time server. JBJ intimates that this may be due to a missing patch in the kernel.
(Note: the patch I was remembering is the 500/HZ setting limit of 0 because HZ is different on alpha). The adjtime syscall is returning EINVAL. Off to glibc for further investigation since nm ntpdate | grep adjtime U adjtime@@GLIBC_2.1
It works for me on this Alpha here, with the xntp3 package from 6.1.