date(1) 맨 페이지 - 윈디하나의 솔라나라

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date

Name
     date - write the date and time

Synopsis
     /usr/bin/date [-u] [+format]


     /usr/bin/date [-a [-]sss.fff]


     /usr/bin/date [-u] [ [mmdd] HHMM | mmddHHMM [cc] yy] [.SS]


     /usr/xpg4/bin/date [-u] [+format]


     /usr/xpg4/bin/date [-a [-]sss.fff]


     /usr/xpg4/bin/date [-u]
          [ [mmdd] HHMM | mmddHHMM [cc] yy] [.SS]

Description
     The date utility writes the date and time to standard output
     or attempts to set the system date and time. By default, the
     current date and time is written.


     Specifications of native language translations of month  and
     weekday  names  are  supported.  The month and weekday names
     used for a language are based on the locale specified by the
     environment variable LC_TIME. See environ(5).


     The following is the default form for the C locale:

       %a %b %e %T %Z %Y



     For example,

       Fri Dec 23 10:10:42 EST 1988

Options
     The following options are supported:

     -a [-]sss.fff
                            Slowly adjust  the  time  by  sss.fff
                            seconds  (fff represents fractions of
                            a second).  This  adjustment  can  be
                            positive  or  negative.  The system's
                            clock is sped up or slowed down until
                            it  has  drifted  by  the  number  of
                            seconds specified.  Only  the  super-
                            user may adjust the time.


     -u
                            Display  (or   set)   the   date   in
                            Greenwich  Mean  Time  (GMT-universal
                            time), bypassing the  normal  conver-
                            sion to (or from) local time.

Operands
     The following operands are supported:

     +format
                If the argument begins with +, the output of date
                is  the  result of passing format and the current
                time to  strftime().  date  uses  the  conversion
                specifications  listed on the strftime(3C) manual
                page, with the conversion  specification  for  %C
                determined    by    whether    /usr/bin/date   or
                /usr/xpg4/bin/date is used:

                /usr/bin/date
                                      Locale's  date   and   time
                                      representation. This is the
                                      default output for date.


                /usr/xpg4/bin/date
                                      Century (a year divided  by
                                      100  and  truncated  to  an
                                      integer)   as   a   decimal
                                      number [00-99].

                Additionally, date supports %N  which  represents
                nanosecond   portion  of  the  current time since
                Epoch (00:00:00  UTC,  January  1,  1970)   as  a
                decimal number [000000000-999999999]. The conver-
                sion specification accepts an optional flag char-
                acter,   an  optional  field  width,  or  both as
                specified in strftime() with a  difference  that,
                if a field width specified is less than nine, the
                actual date output contains  only  the  specified
                amount of digits of the nanoseconds from left.

                The string is always terminated with  a  NEWLINE.
                An argument containing blanks must be quoted; see
                the EXAMPLES section.

     mm
                Month number


     dd
                Day number in the month


     HH
                Hour number (24 hour system)


     MM
                Minute number


     SS
                Second number


     cc
                Century (a year divided by 100 and  truncated  to
                an  integer)  as  a  decimal  number [00-99]. For
                example, cc is 19 for the year 1988  and  20  for
                the year 2007.


     yy
                Last two digits of the year  number.  If  century
                (cc)  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 month, day, year number, and century may be omitted; the
     current  values  are  applied  as defaults. For example, the
     following entry:

       example% date 10080045




     sets the date to Oct 8, 12:45 a.m. The current year  is  the
     default  because no year is supplied. The system operates in
     GMT. date takes care of the conversion  to  and  from  local
     standard  and  daylight time. Only the super-user may change
     the date. After successfully setting the date and time, date
     displays  the  new date according to the default format. The
     date command uses TZ to  determine  the  correct  time  zone
     information; see environ(5).

Examples
     Example 1 Generating Output

     The following command:


       example% date `+DATE: %m/%d/%y%nTIME:%H:%M:%S'




     generates as output


       DATE: 08/01/76

       TIME: 14:45:05



     Example 2 Setting the Current Time


     The following command sets the current time to 12:34:56:


       example# date 1234.56



     Example 3 Setting Another Time and Date  in  Greenwich  Mean
     Time


     The following command sets the date to  January  1st,  12:30
     am, 2000:


       example# date -u 010100302000




     This is displayed as:


       Thu Jan 01 00:30:00 GMT 2000

Environment Variables
     See environ(5) for descriptions of the following environment
     variables  that  affect the execution of date: LANG, LC_ALL,
     LC_CTYPE, LC_TIME, LC_MESSAGES, and NLSPATH.

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

Exit Status
     The following exit values are returned:

     0
           Successful completion.


     >0
           An error occurred.

Attributes
     See attributes(5) for descriptions of the  following  attri-
     butes:

  /usr/bin/date
     tab() box; cw(2.75i) |cw(2.75i) lw(2.75i) |lw(2.75i)  ATTRI-
     BUTE  TYPEATTRIBUTE  VALUE  _  Availabilitysystem/core-os  _
     CSIEnabled


  /usr/xpg4/bin/date
     tab() box; cw(2.75i) |cw(2.75i) lw(2.75i) |lw(2.75i)  ATTRI-
     BUTE  TYPEATTRIBUTE  VALUE _ Availabilitysystem/xopen/xcu4 _
     CSIEnabled  _  Interface  StabilityCommitted  _  StandardSee
     standards(5).

See Also
     strftime(3C), attributes(5), environ(5), standards(5)

Diagnostics
     no permission
                       You are not the super-user and  you  tried
                       to change the date.


     bad conversion
                       The date set is syntactically incorrect.

Notes
     If you attempt to set the current date to one of  the  dates
     that the standard and alternate time zones change (for exam-
     ple, the date that daylight time is starting or ending), and
     you  attempt  to  set  the  time  to  a time in the interval
     between the end of standard time and the  beginning  of  the
     alternate  time  (or  the  end of the alternate time and the
     beginning of standard time), the results are unpredictable.

     Using the date command from within windowing environments to
     change  the  date  can  lead to unpredictable results and is
     unsafe. It can also be unsafe in the multi-user  mode,  that
     is,  outside  of  a windowing system, if the date is changed
     rapidly back and forth. The recommended method  of  changing
     the date is `date -a'.


     Setting the system time or allowing the system time to  pro-
     gress  beyond  03:14:07 UTC Jan 19, 2038 is not supported on
     Solaris.
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