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NetBSD 6.1.5 - man page for date (netbsd section 1)

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

     date -- display or set date and time

     date [-ajnu] [-d date] [-r seconds] [+format] [[[[[[CC]yy]mm]dd]HH]MM[.SS]]

     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:

     -a      Use adjtime(2) to change the local system time slowly, maintaining it as a monotoni-
	     cally increasing function.  -a implies -n.

     -d date
	     Parse the provided human-described date and time and display the result without
	     actually changing the system clock.  (See parsedate(3) for examples.)

     -j      Parse the provided canonical representation of date and time (described below) and
	     display the result without actually changing the system clock.

     -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 cur-
	     rent machine.

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

     -u      Display or set the date in UTC (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:

	   CC	   The first two digits of the year (the century).
	   yy	   The second two digits of the year.  If yy is specified, but CC is not, a value
		   for yy between 69 and 99 results in a CC value of 19.  Otherwise, a CC value
		   of 20 is used.
	   mm	   The month of the year, from 01 to 12.
	   dd	   The day of the month, from 01 to 31.
	   HH	   The hour of the day, from 00 to 23.
	   MM	   The minute of the hour, from 00 to 59.
	   SS	   The second of the minute, from 00 to 61.

     Everything but the minutes is optional.

     Time changes for Daylight Saving and Standard time and leap seconds and years are handled

     The following environment variables affect the execution of date:

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

     /etc/localtime	Symlink pointing to system's default timezone information file in
			/usr/share/zoneinfo directory.
     /var/log/wtmp	A record of date resets and time changes.
     /var/log/messages	A record of the user setting the time.

     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.

     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(8) synchronizes the time on many hosts, the setting of a new time
     value may require more than a few seconds.  On these occasions, date prints: 'Network time
     being set'.  The message 'Communication error with timed' occurs when the communication
     between date and timed fails.

     adjtime(2), gettimeofday(2), settimeofday(2), parsedate(3), strftime(3), utmp(5), timed(8)

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

     The date utility is expected to be compatible with IEEE Std 1003.2 (``POSIX.2'').

BSD					November 15, 2006				      BSD

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