SCCS-vsn: bin/date/date.1 6.2
.\" All rights reserved. The Berkeley software License Agreement
.\" specifies the terms and conditions for redistribution.
.\"
.\" All rights reserved. The Berkeley software License Agreement
.\" specifies the terms and conditions for redistribution.
.\"
-.\" @(#)date.1 6.1 (Berkeley) %G%
+.\" @(#)date.1 6.2 (Berkeley) %G%
.RB "[ -u ] [ yymmddhhmm [ " . "ss ] ]"
.SH DESCRIPTION
If no arguments are given, the current date and time are printed.
.RB "[ -u ] [ yymmddhhmm [ " . "ss ] ]"
.SH DESCRIPTION
If no arguments are given, the current date and time are printed.
-If a date is specified, the current date is set.
+Providing an argument will set the desired date.
+Only the superuser can set the date.
-flag is used to display the date in GMT (universal) time.
-This flag may also be used to set GMT time.
+flag is used to display or set the date in GMT (universal) time.
-is the last two digits of the year;
+represents the last two digits of the year;
the first
.I mm
is the month number;
.I dd
the first
.I mm
is the month number;
.I dd
-is the day number in the month;
.I hh
is the hour number (24 hour system);
the second
.I mm
is the minute number;
.BI . ss
.I hh
is the hour number (24 hour system);
the second
.I mm
is the minute number;
.BI . ss
-is optional and is the seconds.
+is optional and represents the seconds.
-sets the date to Oct 8, 12:45 AM.
-The year, month and day may be omitted, the current
-values being the defaults.
+sets the date to June 13 1985, 4:27 PM.
+The year, month and day may be omitted; the default
+values will be the current ones.
The system operates in GMT.
.I Date
takes care of the conversion to and from
The system operates in GMT.
.I Date
takes care of the conversion to and from
-local standard and daylight time.
+local standard and daylight-saving time.
+.PP
+If
+.I timed(8)
+is running to synchronize the clocks of machines in a local
+area network, \fIdate\fP sets the time globally on all those
+machines.
-/usr/adm/wtmp to record time-setting
+/usr/adm/wtmp to record time-setting.
+In /usr/adm/messages, \fIdate\fP records the name of the user
+setting the time.
+gettimeofday(2), utmp(5), timed(8),
+.br
+\fITSP: The Time Synchronization Protocol for UNIX 4.3BSD\fP,
+R. Gusella and S. Zatti
-`Failed to set date: Not owner' if you try to change the date
+`You are not superuser: date not set' if you try to change the date
but are not the super-user.
but are not the super-user.
+Occasionally, when \fItimed\fP synchronizes the time on many hosts,
+the setting of a new time value may require more than a few seconds.
+On these occasions, \fIdate\fP prints: `Network time being set'.
+The message `Communication error with timed' occurs when the communication
+between \fIdate\fP and \fItimed\fP fails.
.SH BUGS
The system attempts to keep the date in a format closely compatible
with VMS. VMS, however, uses local time (rather than GMT) and does
.SH BUGS
The system attempts to keep the date in a format closely compatible
with VMS. VMS, however, uses local time (rather than GMT) and does
-not understand daylight savings time. Thus if you use both UNIX
+not understand daylight-saving time. Thus, if you use both UNIX
and VMS, VMS will be running on GMT.
and VMS, VMS will be running on GMT.