xref: /third_party/tzdata/date.1.txt

date(1)                     General Commands Manual                    date(1)

NAME
       date - show and set date and time

SYNOPSIS
       date [ -u ] [ -c ] [ -r seconds ] [ +format ] [ [yyyy]mmddhhmm[yy][.ss]
       ]

DESCRIPTION
       The date command without arguments writes the date and time to the
       standard output in the form
                            Wed Mar  8 14:54:40 EST 1989
       with EST replaced by the local time zone's abbreviation (or by the
       abbreviation for the time zone specified in the TZ environment variable
       if set).  The exact output format depends on the locale.

       If a command-line argument starts with a plus sign ("+"), the rest of
       the argument is used as a format that controls what appears in the
       output.  In the format, when a percent sign ("%" appears, it and the
       character after it are not output, but rather identify part of the date
       or time to be output in a particular way (or identify a special
       character to output):

             Sample output                 Explanation
         %a  Wed                           Abbreviated weekday name*
         %A  Wednesday                     Full weekday name*
         %b  Mar                           Abbreviated month name*
         %B  March                         Full month name*
         %c  Wed Mar 08 14:54:40 1989      Date and time*
         %C  19                            Century
         %d  08                            Day of month (always two digits)
         %D  03/08/89                      Month/day/year (eight characters)
         %e   8                            Day of month (leading zero blanked)
         %h  Mar                           Abbreviated month name*
         %H  14                            24-hour-clock hour (two digits)
         %I  02                            12-hour-clock hour (two digits)
         %j  067                           Julian day number (three digits)
         %k   2                            12-hour-clock hour (leading zero blanked)
         %l  14                            24-hour-clock hour (leading zero blanked)
         %m  03                            Month number (two digits)
         %M  54                            Minute (two digits)
         %n  \n                            newline character
         %p  PM                            AM/PM designation
         %r  02:54:40 PM                   Hour:minute:second AM/PM designation
         %R  14:54                         Hour:minute
         %S  40                            Second (two digits)
         %t  \t                            tab character
         %T  14:54:40                      Hour:minute:second
         %U  10                            Sunday-based week number (two digits)
         %w  3                             Day number (one digit, Sunday is 0)
         %W  10                            Monday-based week number (two digits)
         %x  03/08/89                      Date*
         %X  14:54:40                      Time*
         %y  89                            Last two digits of year
         %Y  1989                          Year in full
         %z  -0500                         Numeric time zone
         %Z  EST                           Time zone abbreviation
         %+  Wed Mar  8 14:54:40 EST 1989  Default output format*
       * The exact output depends on the locale.

       If a character other than one of those shown above appears after a
       percent sign in the format, that following character is output.  All
       other characters in the format are copied unchanged to the output; a
       newline character is always added at the end of the output.

       In Sunday-based week numbering, the first Sunday of the year begins
       week 1; days preceding it are part of "week 0".  In Monday-based week
       numbering, the first Monday of the year begins week 1.

       To set the date, use a command line argument with one of the following
       forms:
         1454         24-hour-clock hours (first two digits) and minutes
         081454       Month day (first two digits), hours, and minutes
         03081454     Month (two digits, January is 01), month day, hours, minutes
         8903081454   Year, month, month day, hours, minutes
         0308145489   Month, month day, hours, minutes, year
                      (on System V-compatible systems)
         030814541989 Month, month day, hours, minutes, four-digit year
         198903081454 Four-digit year, month, month day, hours, minutes
       If the century, year, month, or month day is not given, the current
       value is used.  Any of the above forms may be followed by a period and
       two digits that give the seconds part of the new time; if no seconds
       are given, zero is assumed.

       These options are available:

       -u or -c
              Use Universal Time when setting and showing the date and time.

       -r seconds
              Output  the  date  that corresponds to seconds past the epoch of
              1970-01-01 00:00:00 UTC, where seconds  should  be  an  integer,
              either  decimal, octal (leading 0), or hexadecimal (leading 0x),
              preceded by an optional sign.

FILES
       /etc/localtime                  local timezone file
       /usr/lib/locale/L/LC_TIME       description of time locale L
       /usr/share/zoneinfo             timezone directory
       /usr/share/zoneinfo/posixrules  default DST rules (obsolete)
       /usr/share/zoneinfo/GMT         for UTC leap seconds

       If /usr/share/zoneinfo/GMT is absent, UTC leap seconds are loaded  from
       /usr/share/zoneinfo/GMT0 if present.

Time Zone Database                                                     date(1)