.\" 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.
.\" %sccs.include.redist.roff%
.\" @(#)date.1 8.3 (Berkeley) %G%
.Nd display or set date and time
.Op [yy[mm[dd[hh]]]]mm[\&.ss]
displays the current date and time when invoked without arguments.
Providing arguments will format the date and time in a user-defined
Only the superuser may set the date.
The options are as follows:
Set the kernel's value for daylight savings time.
is non-zero, future calls
is used to synchronize the clocks on groups of machines.
will set the time on all of the machines in the local group.
from setting the time for other than the current machine.
Print out the date and time in
Set the kernel's value for minutes west of
specifies the number of minutes returned in
Display or set the date in
An operand with a leading plus (``+'') 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
manual page, as well as any arbitrary text.
A <newline> character is always output after the characters specified by
The format string for the default display is:
.Bd -literal -offset indent
``%a %b %e %H:%M:%S %Z %Y''.
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:
.Bl -tag -width Ds -compact -offset indent
Year in abbreviated form (.e.g 89 for 1989).
Day, a number from 1 to 31.
Hour, a number from 0 to 23.
Minutes, a number from 0 to 59.
Seconds, a number from 0 to 61 (59 plus a a maximum of two leap seconds).
Everything but the minutes is optional.
Time changes for Daylight Saving and Standard time and leap seconds
and years are handled automatically.
.Bd -literal -offset indent
date ``+DATE: %m/%d/%y%nTIME: %H:%M:%S''
.Bd -literal -offset indent
.Bd -literal -offset indent
.Dq Li "June 13, 1985, 4:27 PM" .
.Bd -literal -offset indent
without modifying the date.
.Sh ENVIRONMENTAL VARIABLES
The following environment variables affect the execution of
The timezone to use when displaying dates.
.Bl -tag -width /var/log/messages -compact
A record of date resets and time changes.
A record of the user setting the time.
.%T "TSP: The Time Synchronization Protocol for UNIX 4.3BSD"
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.
synchronizes the time on many hosts, the setting of a new time value may
require more than a few seconds.
.Ql Network time being set .
.Ql Communication error with timed
occurs when the communication
The system attempts to keep the date in a format closely compatible
however, uses local time (rather than
and does not understand daylight-savings time.
command is expected to be compatible with