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DATE(1P)		   POSIX Programmer's Manual		      DATE(1P)

PROLOG
       This  manual  page is part of the POSIX Programmer's Manual.  The Linux
       implementation of this interface may differ (consult the	 corresponding
       Linux  manual page for details of Linux behavior), or the interface may
       not be implemented on Linux.

NAME
       date - write the date and time

SYNOPSIS
       date [-u] [+format]

       date [-u] mmddhhmm[[cc]yy]

DESCRIPTION
       The date utility shall write the date and time to standard  output   or
       attempt	to set the system date and time.  By default, the current date
       and time shall be written. If an operand beginning with '+'  is	speci‐
       fied,  the  output format of date shall be controlled by the conversion
       specifications and other text in the operand.

OPTIONS
       The date utility shall  conform	to  the	 Base  Definitions  volume  of
       IEEE Std 1003.1-2001, Section 12.2, Utility Syntax Guidelines.

       The following option shall be supported:

       -u     Perform  operations as if the TZ environment variable was set to
	      the string "UTC0", or its equivalent historical value of	"GMT0"
	      .	 Otherwise,  date  shall  use the timezone indicated by the TZ
	      environment variable or the system default if that  variable  is
	      unset or null.

OPERANDS
       The following operands shall be supported:

       +format
	      When the format is specified, each conversion specifier shall be
	      replaced in the standard output by its corresponding value.  All
	      other  characters	 shall be copied to the output without change.
	      The output shall always be terminated with a <newline>.

   Conversion Specifications
       %a     Locale's abbreviated weekday name.

       %A     Locale's full weekday name.

       %b     Locale's abbreviated month name.

       %B     Locale's full month name.

       %c     Locale's appropriate date and time representation.

       %C     Century (a year divided by 100 and truncated to an integer) as a
	      decimal number [00,99].

       %d     Day of the month as a decimal number [01,31].

       %D     Date in the format mm/dd/yy.

       %e     Day of the month as a decimal number [1,31] in a two-digit field
	      with leading space character fill.

       %h     A synonym for %b .

       %H     Hour (24-hour clock) as a decimal number [00,23].

       %I     Hour (12-hour clock) as a decimal number [01,12].

       %j     Day of the year as a decimal number [001,366].

       %m     Month as a decimal number [01,12].

       %M     Minute as a decimal number [00,59].

       %n     A <newline>.

       %p     Locale's equivalent of either AM or PM.

       %r     12-hour clock time [01,12] using	the  AM/PM  notation;  in  the
	      POSIX locale, this shall be equivalent to %I : %M : %S %p .

       %S     Seconds as a decimal number [00,60].

       %t     A <tab>.

       %T     24-hour clock time [00,23] in the format HH:MM:SS.

       %u     Weekday as a decimal number [1,7] (1=Monday).

       %U     Week of the year (Sunday as the first day of the week) as a dec‐
	      imal number [00,53]. All days in a new year preceding the	 first
	      Sunday shall be considered to be in week 0.

       %V     Week of the year (Monday as the first day of the week) as a dec‐
	      imal number [01,53]. If the week containing January 1  has  four
	      or  more	days in the new year, then it shall be considered week
	      1; otherwise, it shall be the last week of  the  previous	 year,
	      and the next week shall be week 1.

       %w     Weekday as a decimal number [0,6] (0=Sunday).

       %W     Week of the year (Monday as the first day of the week) as a dec‐
	      imal number [00,53]. All days in a new year preceding the	 first
	      Monday shall be considered to be in week 0.

       %x     Locale's appropriate date representation.

       %X     Locale's appropriate time representation.

       %y     Year within century [00,99].

       %Y     Year with century as a decimal number.

       %Z     Timezone name, or no characters if no timezone is determinable.

       %%     A percent sign character.

       See the Base Definitions volume of IEEE Std 1003.1-2001, Section 7.3.5,
       LC_TIME for the conversion specifier values in the POSIX locale.

   Modified Conversion Specifications
       Some conversion specifiers can be modified by  the  E  and  O  modifier
       characters to indicate a different format or specification as specified
       in the LC_TIME locale description (see the Base Definitions  volume  of
       IEEE Std 1003.1-2001,  Section  7.3.5,  LC_TIME).  If the corresponding
       keyword (see era, era_year, era_d_fmt, and alt_digits in the Base Defi‐
       nitions	volume of IEEE Std 1003.1-2001, Section 7.3.5, LC_TIME) is not
       specified or not supported for the current locale, the unmodified  con‐
       version specifier value shall be used.

       %Ec    Locale's alternative appropriate date and time representation.

       %EC    The  name	 of the base year (period) in the locale's alternative
	      representation.

       %Ex    Locale's alternative date representation.

       %EX    Locale's alternative time representation.

       %Ey    Offset from %EC (year only) in the locale's  alternative	repre‐
	      sentation.

       %EY    Full alternative year representation.

       %Od    Day of month using the locale's alternative numeric symbols.

       %Oe    Day of month using the locale's alternative numeric symbols.

       %OH    Hour (24-hour clock) using the locale's alternative numeric sym‐
	      bols.

       %OI    Hour (12-hour clock) using the locale's alternative numeric sym‐
	      bols.

       %Om    Month using the locale's alternative numeric symbols.

       %OM    Minutes using the locale's alternative numeric symbols.

       %OS    Seconds using the locale's alternative numeric symbols.

       %Ou    Weekday  as  a number in the locale's alternative representation
	      (Monday = 1).

       %OU    Week number of the year (Sunday as the first day	of  the	 week)
	      using the locale's alternative numeric symbols.

       %OV    Week  number  of	the year (Monday as the first day of the week,
	      rules corresponding to %V	 ),  using  the	 locale's  alternative
	      numeric symbols.

       %Ow    Weekday  as  a number in the locale's alternative representation
	      (Sunday = 0).

       %OW    Week number of the year (Monday as the first day	of  the	 week)
	      using the locale's alternative numeric symbols.

       %Oy    Year (offset from %C ) in alternative representation.

       mmddhhmm[[cc]yy]

	      Attempt  to set the system date and time from the value given in
	      the operand. This is only possible if the user  has  appropriate
	      privileges and the system permits the setting of the system date
	      and time. The first mm is the month  (number);  dd  is  the  day
	      (number); hh is the hour (number, 24-hour system); the second mm
	      is the minute (number); cc is the century and is the  first  two
	      digits of the year (this is optional); yy is the last two digits
	      of the year and is optional.  If century is not specified,  then
	      values  in  the  range [69,99] shall refer to years 1969 to 1999
	      inclusive, and values in the range [00,68] shall refer to	 years
	      2000 to 2068 inclusive. The current year is the default if yy is
	      omitted.

       Note:
	      It is expected that in a future version of  IEEE Std 1003.1-2001
	      the  default  century  inferred from a 2-digit year will change.
	      (This would apply to all commands accepting a  2-digit  year  as
	      input.)

STDIN
       Not used.

INPUT FILES
       None.

ENVIRONMENT VARIABLES
       The following environment variables shall affect the execution of date:

       LANG   Provide  a  default value for the internationalization variables
	      that are unset or null. (See  the	 Base  Definitions  volume  of
	      IEEE Std 1003.1-2001,  Section  8.2,  Internationalization Vari‐
	      ables for the precedence of internationalization variables  used
	      to determine the values of locale categories.)

       LC_ALL If  set  to a non-empty string value, override the values of all
	      the other internationalization variables.

       LC_CTYPE
	      Determine the locale for	the  interpretation  of	 sequences  of
	      bytes  of	 text  data as characters (for example, single-byte as
	      opposed to multi-byte characters in arguments).

       LC_MESSAGES
	      Determine the locale that should be used to  affect  the	format
	      and contents of diagnostic messages written to standard error.

       LC_TIME
	      Determine the format and contents of date and time strings writ‐
	      ten by date.

       NLSPATH
	      Determine the location of message catalogs for the processing of
	      LC_MESSAGES .

       TZ     Determine	 the  timezone in which the time and date are written,
	      unless the -u option is specified. If the TZ variable  is	 unset
	      or  null	and -u is not specified, an unspecified system default
	      timezone is used.

ASYNCHRONOUS EVENTS
       Default.

STDOUT
       When no formatting operand is specified, the output in the POSIX locale
       shall be equivalent to specifying:

	      date "+%a %b %e %H:%M:%S %Z %Y"

STDERR
       The standard error shall be used only for diagnostic messages.

OUTPUT FILES
       None.

EXTENDED DESCRIPTION
       None.

EXIT STATUS
       The following exit values shall be returned:

	0     The date was written successfully.

       >0     An error occurred.

CONSEQUENCES OF ERRORS
       Default.

       The following sections are informative.

APPLICATION USAGE
       Conversion  specifiers  are of unspecified format when not in the POSIX
       locale. Some of them can contain <newline>s in some locales, so it  may
       be difficult to use the format shown in standard output for parsing the
       output of date in those locales.

       The range of values for %S extends from 0 to 60 seconds to  accommodate
       the occasional leap second.

       Although certain of the conversion specifiers in the POSIX locale (such
       as the name of the month) are shown with initial capital letters,  this
       need  not be the case in other locales. Programs using these fields may
       need to adjust the capitalization if the output is going to be used  at
       the beginning of a sentence.

       The  date string formatting capabilities are intended for use in Grego‐
       rian-style calendars, possibly  with  a	different  starting  year  (or
       years).	The %x and %c conversion specifications, however, are intended
       for local representation; these may be based on a different, non-Grego‐
       rian calendar.

       The  %C conversion specification was introduced to allow a fallback for
       the %EC (alternative year format base year); it can be  viewed  as  the
       base  of the current subdivision in the Gregorian calendar. The century
       number is calculated as the year divided by 100	and  truncated	to  an
       integer;	 it should not be confused with the use of ordinal numbers for
       centuries (for example, "twenty-first century".) Both the  %Ey  and  %y
       can then be viewed as the offset from %EC and %C, respectively.

       The  E and O modifiers modify the traditional conversion specifiers, so
       that they can always be used, even if the implementation (or  the  cur‐
       rent locale) does not support the modifier.

       The  E modifier supports alternative date formats, such as the Japanese
       Emperor's Era, as long as these are based  on  the  Gregorian  calendar
       system. Extending the E modifiers to other date elements may provide an
       implementation-defined extension capable of supporting  other  calendar
       systems, especially in combination with the O modifier.

       The O modifier supports time and date formats using the locale's alter‐
       native numerical symbols, such as Kanji or Hindi digits or ordinal num‐
       ber representation.

       Non-European  locales,  whether	they use Latin digits in computational
       items or not, often have local forms of the digits for use in date for‐
       mats.  This  is	not totally unknown even in Europe; a variant of dates
       uses Roman numerals for the months: the third  day  of  September  1991
       would  be  written  as  3.IX.1991. In Japan, Kanji digits are regularly
       used for dates; in Arabic-speaking countries, Hindi  digits  are	 used.
       The  %d,	 %e,  %H, %I, %m, %S, %U, %w, %W, and %y conversion specifica‐
       tions always return the date and time field in Latin digits (that is, 0
       to  9).	The  %O modifier was introduced to support the use for display
       purposes of non-Latin digits. In the LC_TIME category in localedef, the
       optional	 alt_digits  keyword is intended for this purpose. As an exam‐
       ple, assume the following (partial) localedef source:

	      alt_digits  "";"I";"II";"III";"IV";"V";"VI";"VII";"VIII" \
			  "IX";"X";"XI";"XII"
	      d_fmt	  "%e.%Om.%Y"

       With the above date, the command:

	      date "+%x"

       would yield 3.IX.1991. With the same d_fmt, but without the alt_digits,
       the command would yield 3.9.1991.

EXAMPLES
	1. The	following  are input/output examples of date used at arbitrary
	   times in the POSIX locale:

	   $ date
	   Tue Jun 26 09:58:10 PDT 1990

	   $ date "+DATE: %m/%d/%y%nTIME: %H:%M:%S"
	   DATE: 11/02/91
	   TIME: 13:36:16

	   $ date "+TIME: %r"
	   TIME: 01:36:32 PM

	2. Examples for Denmark, where the default date and time format is  %a
	   %d %b %Y %T %Z :

	   $ LANG=da_DK.iso_8859-1 date
	   ons 02 okt 1991 15:03:32 CET

	   $ LANG=da_DK.iso_8859-1 \
	       date "+DATO: %A den %e. %B %Y%nKLOKKEN: %H:%M:%S"
	   DATO: onsdag den 2. oktober 1991
	   KLOKKEN: 15:03:56

	3. Examples  for Germany, where the default date and time format is %a
	   %d . %h . %Y, %T %Z :

	   $ LANG=De_DE.88591 date
	   Mi 02.Okt.1991, 15:01:21 MEZ

	   $ LANG=De_DE.88591 date "+DATUM: %A, %d. %B %Y%nZEIT: %H:%M:%S"
	   DATUM: Mittwoch, 02. Oktober 1991
	   ZEIT: 15:02:02

	4. Examples for France, where the default date and time format	is  %a
	   %d %h %Y %Z %T :

	   $ LANG=Fr_FR.88591 date
	   Mer 02 oct 1991 MET 15:03:32

	   $ LANG=Fr_FR.88591 date "+JOUR: %A %d %B %Y%nHEURE: %H:%M:%S"
	   JOUR: Mercredi 02 octobre 1991
	   HEURE: 15:03:56

RATIONALE
       Some  of	 the  new  options for formatting are from the ISO C standard.
       The -u option was introduced to allow portable  access  to  Coordinated
       Universal  Time (UTC). The string "GMT0" is allowed as an equivalent TZ
       value to be compatible with all of the systems using the BSD  implemen‐
       tation, where this option originated.

       The  %e	format	conversion  specification  (adopted from System V) was
       added because the ISO C standard conversion specifications did not pro‐
       vide  any  way to produce the historical default date output during the
       first nine days of any month.

       There are two varieties of day and week numbering supported  (in	 addi‐
       tion to any others created with the locale-dependent %E and %O modifier
       characters):

	* The historical variety in which Sunday is the first day of the  week
	  and  the weekdays preceding the first Sunday of the year are consid‐
	  ered week 0. These are represented by %w and %U . A variant of  this
	  is  %W,  using Monday as the first day of the week, but still refer‐
	  ring to week 0. This view of the calendar was	 retained  because  so
	  many	historical  applications  depend  on it and the ISO C standard
	  strftime() function, on which many date implementations  are	based,
	  was defined in this way.

	* The  international  standard,	 based	on  the ISO 8601:2000 standard
	  where Monday is the first weekday and the algorithm  for  the	 first
	  week number is more complex: If the week (Monday to Sunday) contain‐
	  ing January 1 has four or more days in the new year, then it is week
	  1;  otherwise, it is week 53 of the previous year, and the next week
	  is week 1. These are represented by the  new	conversion  specifica‐
	  tions %u and %V, added as a result of international comments.

FUTURE DIRECTIONS
       None.

SEE ALSO
       The  System  Interfaces volume of IEEE Std 1003.1-2001, printf(), strf‐
       time()

COPYRIGHT
       Portions of this text are reprinted and reproduced in  electronic  form
       from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
       -- Portable Operating System Interface (POSIX),	The  Open  Group  Base
       Specifications  Issue  6,  Copyright  (C) 2001-2003 by the Institute of
       Electrical and Electronics Engineers, Inc and The Open  Group.  In  the
       event of any discrepancy between this version and the original IEEE and
       The Open Group Standard, the original IEEE and The Open Group  Standard
       is  the	referee document. The original Standard can be obtained online
       at http://www.opengroup.org/unix/online.html .

IEEE/The Open Group		     2003			      DATE(1P)
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