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authorIndrajith K L2022-12-03 17:00:20 +0530
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+date(P) date(P)
+
+
+
+
+
+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 stan-
+ dard 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 specified, the out-
+ put 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 vari-
+ able was set to the string "UTC0" , or its equiv-
+ alent 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 out-
+ put by its corresponding value. All other char-
+ acters 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 representa-
+ tion.
+
+ %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 nota-
+ tion; in the POSIX locale, this shall be equiva-
+ lent 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 decimal number [00,53]. All days in a
+ new year preceding the first Sunday shall be con-
+ sidered to be in week 0.
+
+ %V Week of the year (Monday as the first day of the
+ week) as a decimal 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 pre-
+ vious 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 decimal number [00,53]. All days in a
+ new year preceding the first Monday shall be con-
+ sidered 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 val-
+ ues 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 Definitions 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 conversion 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 representation.
+
+ %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 alterna-
+ tive numeric symbols.
+
+ %OI Hour (12-hour clock) using the locale's alterna-
+ tive numeric symbols.
+
+ %Om Month using the locale's alternative numeric sym-
+ bols.
+
+ %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 representa-
+ tion.
+
+
+
+ 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 dig-
+ its 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 internationaliza-
+ tion variables that are unset or null. (See the
+ Base Definitions volume of IEEE Std 1003.1-2001,
+ Section 8.2, Internationalization Variables for
+ the precedence of internationalization variables
+ used to determine the values of locale cate-
+ gories.)
+
+ 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 mes-
+ sages written to standard error.
+
+ LC_TIME
+ Determine the format and contents of date and
+ time strings written 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 for-
+ mat 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 Gregorian-style calendars, possibly with a dif-
+ ferent starting year (or years). The %x and %c conver-
+ sion specifications, however, are intended for local
+ representation; these may be based on a different, non-
+ Gregorian 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 sub-
+ division 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 current 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 imple-
+ mentation-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 alternative numerical symbols, such as Kanji or
+ Hindi digits or ordinal number 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 formats. 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 coun-
+ tries, Hindi digits are used. The %d , %e , %H , %I , %m
+ , %S , %U , %w , %W , and %y conversion specifications
+ 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 dig-
+ its. In the LC_TIME category in localedef, the optional
+ alt_digits keyword is intended for this purpose. As an
+ example, 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
+ 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
+
+ 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
+
+ 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
+
+ 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 imple-
+ mentation, where this option originated.
+
+ The %e format conversion specification (adopted from
+ System V) was added because the ISO C standard conver-
+ sion specifications did not provide 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 sup-
+ ported (in addition 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 considered 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 referring 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 num-
+ ber is more complex: If the week (Monday to Sun-
+ day) containing 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 specifications %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(), strftime()
+
+COPYRIGHT
+ Portions of this text are reprinted and reproduced in
+ electronic form from IEEE Std 1003.1, 2003 Edition,
+ Standard for Information Technology -- Portable Operat-
+ ing System Interface (POSIX), The Open Group Base Speci-
+ fications Issue 6, Copyright (C) 2001-2003 by the Insti-
+ tute 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.open-
+ group.org/unix/online.html .
+
+
+
+POSIX 2003 date(P)