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Revision 1.38, Sun Nov 26 16:40:44 2006 UTC (14 years, 4 months ago) by wiz
Drop trailing whitespace.
.\" $NetBSD: date.1,v 1.38 2006/11/26 16:40:44 wiz Exp $ .\" .\" Copyright (c) 1980, 1990, 1993 .\" The Regents of the University of California. All rights reserved. .\" .\" This code is derived from software contributed to Berkeley by .\" the Institute of Electrical and Electronics Engineers, Inc. .\" .\" Redistribution and use in source and binary forms, with or without .\" modification, are permitted provided that the following conditions .\" are met: .\" 1. Redistributions of source code must retain the above copyright .\" notice, this list of conditions and the following disclaimer. .\" 2. Redistributions in binary form must reproduce the above copyright .\" notice, this list of conditions and the following disclaimer in the .\" documentation and/or other materials provided with the distribution. .\" 3. Neither the name of the University nor the names of its contributors .\" may be used to endorse or promote products derived from this software .\" without specific prior written permission. .\" .\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND .\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE .\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE .\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE .\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL .\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS .\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) .\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT .\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF .\" SUCH DAMAGE. .\" .\" @(#)date.1 8.3 (Berkeley) 4/28/95 .\" .Dd November 15, 2006 .Dt DATE 1 .Os .Sh NAME .Nm date .Nd display or set date and time .Sh SYNOPSIS .Nm .Op Fl ajnu .Op Fl d Ar date .Op Fl r Ar seconds .Op Cm + Ns Ar format .Sm off .Oo Oo Oo Oo Oo Oo .Ar CC Oc .Ar yy Oc .Ar mm Oc .Ar dd Oc .Ar HH Oc Ar MM Oo .Li \&. Ar SS Oc Oc .Sm on .Sh DESCRIPTION .Nm displays the current date and time when invoked without arguments. Providing arguments will format the date and time in a user-defined way or set the date. Only the superuser may set the date. .Pp The options are as follows: .Bl -tag -width Ds .It Fl a Use .Xr adjtime 2 to change the local system time slowly, maintaining it as a monotonically increasing function. .Fl a implies .Fl n . .It Fl d Ar date Parse the provided human-described date and time and display the result without actually changing the system clock. .It Fl j Parse the provided canonical representation of date and time (described below) and display the result without actually changing the system clock. .It Fl n The utility .Xr timed 8 is used to synchronize the clocks on groups of machines. By default, if timed is running, .Nm will set the time on all of the machines in the local group. The .Fl n option stops .Nm from setting the time for other than the current machine. .It Fl r Print out the date and time that is .Ar seconds from the Epoch. .It Fl u Display or set the date in .Tn UTC (universal) time. .El .Pp An operand with a leading plus .Pq Cm + sign signals a user-defined format string which specifies the format in which to display the date and time. The format string may contain any of the conversion specifications described in the .Xr strftime 3 manual page, as well as any arbitrary text. A \*[Lt]newline\*[Gt] character is always output after the characters specified by the format string. The format string for the default display is: .Bd -literal -offset indent %a %b %e %H:%M:%S %Z %Y .Ed .Pp If an operand does not have a leading plus sign, it is interpreted as a value for setting the system's notion of the current date and time. The canonical representation for setting the date and time is: .Pp .Bl -tag -width Ds -compact -offset indent .It Ar CC The first two digits of the year (the century). .It Ar yy The second two digits of the year. If .Ar yy is specified, but .Ar CC is not, a value for .Ar yy between 69 and 99 results in a .Ar CC value of 19. Otherwise, a .Ar CC value of 20 is used. .It Ar mm The month of the year, from 01 to 12. .It Ar dd The day of the month, from 01 to 31. .It Ar HH The hour of the day, from 00 to 23. .It Ar MM The minute of the hour, from 00 to 59. .It Ar SS The second of the minute, from 00 to 61. .El .Pp Everything but the minutes is optional. .Pp Time changes for Daylight Saving and Standard time and leap seconds and years are handled automatically. .Sh ENVIRONMENT The following environment variables affect the execution of .Nm : .Bl -tag -width iTZ .It Ev TZ The timezone to use when displaying dates. See .Xr environ 7 for more information. .El .Sh FILES .Bl -tag -width /var/log/messages -compact .It Pa /etc/localtime Symlink pointing to system's default timezone information file in .Pa /usr/share/zoneinfo directory. .It Pa /var/log/wtmp A record of date resets and time changes. .It Pa /var/log/messages A record of the user setting the time. .El .Sh EXAMPLES The command: .Bd -literal -offset indent date '+DATE: %m/%d/%y%nTIME: %H:%M:%S' .Ed .Pp will display: .Bd -literal -offset indent DATE: 11/21/87 TIME: 13:36:16 .Ed .Pp The command: .Bd -literal -offset indent date 8506131627 .Ed .Pp sets the date to .Dq Li "June 13, 1985, 4:27 PM" . .Pp The command: .Bd -literal -offset indent date 1432 .Ed .Pp sets the time to .Li "2:32 PM" , without modifying the date. .Sh DIAGNOSTICS Exit status is 0 on success, 1 if unable to set the date, and 2 if able to set the local date, but unable to set it globally. .Pp Occasionally, when .Xr timed 8 synchronizes the time on many hosts, the setting of a new time value may require more than a few seconds. On these occasions, .Nm prints: .Ql Network time being set . The message .Ql Communication error with timed occurs when the communication between .Nm and timed fails. .Sh SEE ALSO .Xr adjtime 2 , .Xr gettimeofday 2 , .Xr settimeofday 2 , .Xr parsedate 3 , .Xr strftime 3 , .Xr utmp 5 , .Xr timed 8 .Rs .%T "TSP: The Time Synchronization Protocol for UNIX 4.3BSD" .%A R. Gusella .%A S. Zatti .Re .Sh STANDARDS The .Nm utility is expected to be compatible with .St -p1003.2 .