128 lines
6 KiB
Text
128 lines
6 KiB
Text
NAME
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date - show and set date and time
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SYNOPSIS
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date [ -u ] [ -c ] [ -n ] [ -d dsttype ] [ -t minutes-west ]
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[ -a [+|-]sss.fff ] [ +format ] [ [yyyy]mmddhhmm[yy][.ss] ]
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DESCRIPTION
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Date without arguments writes the date and time to the
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standard output in the form
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Wed Mar 8 14:54:40 EST 1989
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with EST replaced by the local time zone's abbreviation (or
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by the abbreviation for the time zone specified in the TZ
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environment variable if set). The exact output format
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depends on the locale.
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If a command-line argument starts with a plus sign (`+'),
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the rest of the argument is used as a format that controls
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what appears in the output. In the format, when a percent
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sign (`%') appears, it and the character after it are not
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output, but rather identify part of the date or time to be
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output in a particular way (or identify a special character
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to output):
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Sample output Explanation
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%a Wed Abbreviated weekday name*
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%A Wednesday Full weekday name*
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%b Mar Abbreviated month name*
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%B March Full month name*
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%c Wed Mar 08 14:54:40 1989 Date and time*
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%C 19 Century
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%d 08 Day of month (always two digits)
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%D 03/08/89 Month/day/year (eight characters)
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%e 8 Day of month (leading zero blanked)
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%h Mar Abbreviated month name*
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%H 14 24-hour-clock hour (two digits)
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%I 02 12-hour-clock hour (two digits)
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%j 067 Julian day number (three digits)
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%k 2 12-hour-clock hour (leading zero blanked)
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%l 14 24-hour-clock hour (leading zero blanked)
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%m 03 Month number (two digits)
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%M 54 Minute (two digits)
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%n \n newline character
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%p PM AM/PM designation
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%r 02:54:40 PM Hour:minute:second AM/PM designation
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%R 14:54 Hour:minute
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%S 40 Second (two digits)
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%t \t tab character
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%T 14:54:40 Hour:minute:second
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%U 10 Sunday-based week number (two digits)
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%w 3 Day number (one digit, Sunday is 0)
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%W 10 Monday-based week number (two digits)
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%x 03/08/89 Date*
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%X 14:54:40 Time*
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%y 89 Last two digits of year
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%Y 1989 Year in full
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%Z EST Time zone abbreviation
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%+ Wed Mar 8 14:54:40 EST 1989 Default output format*
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* The exact output depends on the locale.
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If a character other than one of those shown above appears
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after a percent sign in the format, that following character
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is output. All other characters in the format are copied
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unchanged to the output; a newline character is always added
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at the end of the output.
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In Sunday-based week numbering, the first Sunday of the year
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begins week 1; days preceding it are part of ``week 0.'' In
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Monday-based week numbering, the first Monday of the year
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begins week 1.
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To set the date, use a command line argument with one of the
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following forms:
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1454 24-hour-clock hours (first two digits) and minutes
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081454 Month day (first two digits), hours, and minutes
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03081454 Month (two digits, January is 01), month day, hours, minutes
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8903081454 Year, month, month day, hours, minutes
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0308145489 Month, month day, hours, minutes, year
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(on System V-compatible systems)
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030814541989 Month, month day, hours, minutes, four-digit year
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198903081454 Four-digit year, month, month day, hours, minutes
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If the century, year, month, or month day is not given, the
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current value is used. Any of the above forms may be
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followed by a period and two digits that give the seconds
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part of the new time; if no seconds are given, zero is
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assumed.
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These options are available:
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-u or -c
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Use UTC when setting and showing the date and time.
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-n Do not notify other networked systems of the time
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change.
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-d dsttype
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Set the kernel-stored Daylight Saving Time type to the
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given value. (The kernel-stored DST type is used
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mostly by ``old'' binaries.)
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-t minutes-west
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Set the kernel-stored ``minutes west of UTC'' value to
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the one given on the command line. (The kernel-stored
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DST type is used mostly by ``old'' binaries.)
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-a adjustment
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Change the time forward (or backward) by the number of
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seconds (and fractions thereof) specified in the
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adjustment argument. Either the seconds part or the
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fractions part of the argument (but not both) may be
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omitted. On BSD-based systems, the adjustment is made
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by changing the rate at which time advances; on
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System-V-based systems, the adjustment is made by
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changing the time.
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FILES
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/usr/lib/locale/L/LC_TIME description of time
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locale L
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/usr/local/etc/zoneinfo time zone information
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directory
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/usr/local/etc/zoneinfo/localtime local time zone file
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/usr/local/etc/zoneinfo/posixrules used with POSIX-style
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TZ's
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/usr/local/etc/zoneinfo/GMT for UTC leap seconds
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If /usr/local/etc/zoneinfo/GMT is absent, UTC leap seconds
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are loaded from /usr/local/etc/zoneinfo/posixrules.
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