date man page on 4.4BSD

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DATE(1)			  BSD General Commands Manual		       DATE(1)

NAME
     date — display or set date and time

SYNOPSIS
     date [-d dst] [-r seconds] [-t minutes_west] [-nu] [+format]
	  [[yy[mm[dd[hh]]]]mm[.ss]]

DESCRIPTION
     Date 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.

     The options are as follows:

     -d	     Set the kernel's value for daylight savings time.	If dst is non-
	     zero, future calls to gettimeofday(2) will return a non-zero
	     ‘tz_dsttime’.

     -n	     The utility timed(8) is used to synchronize the clocks on groups
	     of machines.  By default, if timed is running, date will set the
	     time on all of the machines in the local group.  The -n option
	     stops date from setting the time for other than the current
	     machine.

     -r	     Print out the date and time in seconds from the Epoch.

     -t	     Set the kernel's value for minutes west of GMT.  Minutes_west
	     specifies the number of minutes returned in ‘tz_minuteswest’ by
	     future calls to gettimeofday(2).

     -u	     Display or set the date in UCT (universal) time.

     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 in the strftime(3) manual page, as well as any arbitrary text.
     A <newline> character is always output after the characters specified by
     the format string.	 The format string for the default display is:

	   ``%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:

	   yy	   Year in abbreviated form (.e.g 89 for 1989).
	   mm	   Numeric month.  A number from 1 to 12.
	   dd	   Day, a number from 1 to 31.
	   hh	   Hour, a number from 0 to 23.
	   mm	   Minutes, a number from 0 to 59.
	   .ss	   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.

EXAMPLES
     The command:

	   date ``+DATE: %m/%d/%y%nTIME: %H:%M:%S''

     will display:

	   DATE: 11/21/87
	   TIME: 13:36:16

     The command:

	   date 8506131627

     sets the date to “June 13, 1985, 4:27 PM”.

     The command:

	   date 1432

     sets the time to 2:32 PM, without modifying the date.

ENVIRONMENTAL VARIABLES
     The following environment variables affect the execution of date:

     TZ	 The timezone to use when displaying dates.  See environ(7) for more
	 information.

FILES
     /var/log/wtmp	A record of date resets and time changes.
     /var/log/messages	A record of the user setting the time.

SEE ALSO
     gettimeofday(2), strftime(3), utmp(5), timed(8)

     R. Gusella and S. Zatti, TSP: The Time Synchronization Protocol for UNIX
     4.3BSD.

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.

     Occasionally, when timed synchronizes the time on many hosts, the setting
     of a new time value may require more than a few seconds.  On these occa‐
     sions, date prints: ‘Network time being set’.  The message ‘Communication
     error with timed’ occurs when the communication between date and timed
     fails.

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 under‐
     stand daylight-savings time.  Thus, if you use both UNIX and VMS, VMS
     will be running on GMT.

STANDARDS
     The date command is expected to be compatible with IEEE Std 1003.2
     (“POSIX.2”).

BSD				April 28, 1995				   BSD
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