V8/usr/man/man1/wwv.1

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.TH WWV 1
.SH NAME
wwv \- print and set the date from accurate clock
.SH SYNOPSIS
.B "wwv [ \-b \-s \-f \-u ]
.SH DESCRIPTION
.I Wwv
connects to a clock synchronized with radio station WWV.
With no argument it prints the time obtained.
It accepts these arguments:
.TP
.B \-b
Print both the WWV time and the system's current idea of the time.
.TP
.B \-s
Set the system's time to agree with WWV.
You must be super-user.
The system time cannot be changed by more than 20 minutes.
.TP
.B \-f
With \-s, force the time to be set by WWV even if the local time disagrees
by more than 20 minutes.
.TP
.B \-u
Report time in UTC rather than local time.
.SH FILES
/usr/adm/wtmp to record time-setting
.SH SEE ALSO
date (1), utmp(5)
.SH BUGS
The WWV clock has been observed to slip sync by an integral number
of minutes or hours from the radio standard.