strptime  -  convert  a string representation of time to a
       time tm structure


SYNOPSIS

       #define _XOPEN_SOURCE /* glibc2 needs this */
       #include <time.h>

       char *strptime(const char *s, const char  *format,  struct
       tm *tm);


DESCRIPTION

       The  strptime()  function  is  the  converse  function  to
       strftime() and converts the character string pointed to by
       s  to  values which are stored in the tm structure pointed
       to by tm, using the format specified by format.  Here for­
       mat  is a character string that consists of field descrip­
       tors and text characters, reminiscent of  scanf(3).   Each
       field  descriptor  consists  of  a % character followed by
       another character that specifies the replacement  for  the
       field  descriptor.   All  other  characters  in the format
       string must have a matching character in the input string,
       except  for whitespace, which matches zero or more whites­
       pace characters in the input string.

       The strptime() function processes the  input  string  from
       left  to right.  Each of the three possible input elements
       (whitespace, literal, or format) are handled one after the
       other.   If  the  input  cannot  be  matched to the format
       string the function stops.  The remainder  of  the  format
       and input strings are not processed.

       The  supported  input  field descriptors are listed below.
       In case a text string (such as a weekday or month name) is
       to  be  matched,  the  comparison is case insensitive.  In
       case a number is to be matched, leading zeros are  permit­
       ted but not required.

       %%     The % character.

       %a or %A
              The  weekday  name according to the current locale,
              in abbreviated form or the full name.

       %b or %B or %h
              The month name according to the current locale,  in
              abbreviated form or the full name.

       %c     The  date  and  time representation for the current
              locale.

       %C     The century number (0-99).

              The day of month (1-31).

       %D     Equivalent to %m/%d/%y. (This is the American style
              date,  very  confusing to non-Americans, especially
              since %d/%m/%y is widely used in Europe.   The  ISO
              8601 standard format is %Y-%m-%d.)

       %H     The hour (0-23).

       %I     The hour on a 12-hour clock (1-12).

       %j     The day number in the year (1-366).

       %m     The month number (1-12).

       %M     The minute (0-59).

       %n or %t
              Arbitrary whitespace.

       %p     The  locale's  equivalent of AM or PM. (Note: there
              may be none.)

       %r     The 12-hour clock time (using the  locale's  AM  or
              PM).   In  the  POSIX locale equivalent to %I:%M:%S
              %p.  If t_fmt_ampm is empty in the LC_TIME part  of
              the current locale then the behaviour is undefined.

       %R     Equivalent to %H:%M.

       %S     The second (0-60; 60 may occur  for  leap  seconds;
              earlier also 61 was allowed).

       %T     Equivalent to %H:%M:%S.

       %U     The  week  number  with Sunday the first day of the
              week (0-53).  The first Sunday of  January  is  the
              first day of week 1.

       %w     The weekday number (0-6) with Sunday = 0.

       %W     The  week  number  with Monday the first day of the
              week (0-53).  The first Monday of  January  is  the
              first day of week 1.

       %x     The date, using the locale's date format.

       %X     The time, using the locale's time format.

       %y     The  year within century (0-99).  When a century is
              not otherwise specified, values in the range  69-99
              refer   to   years   in   the   twentieth   century
              (1969-1999); values in the  range  00-68  refer  to


       %Y     The year, including century (for example, 1991).

       Some field descriptors can be modified by the E or O modi­
       fier characters to indicate that an alternative format  or
       specification should be used. If the alternative format or
       specification does not exist in the  current  locale,  the
       unmodified field descriptor is used.

       The E modifier specifies that the input string may contain
       alternative locale-dependent versions of the date and time
       representation:

       %Ec    The  locale's alternative date and time representa­
              tion.

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

       %Ex    The locale's alternative date representation.

       %EX    The locale's alternative time representation.

       %Ey    The  offset  from  %EC  (year only) in the locale's
              alternative representation.

       %EY    The full alternative year representation.

       The O modifier specifies that the numerical input  may  be
       in an alternative locale-dependent format:

       %Od or %Oe
              The day of the month using the locale's alternative
              numeric symbols; leading zeros  are  permitted  but
              not required.

       %OH    The  hour (24-hour clock) using the locale's alter­
              native numeric symbols.

       %OI    The hour (12-hour clock) using the locale's  alter­
              native numeric symbols.

       %Om    The  month  using  the locale's alternative numeric
              symbols.

       %OM    The minutes using the locale's alternative  numeric
              symbols.

       %OS    The  seconds using the locale's alternative numeric
              symbols.

       %OU    The week number of the year (Sunday  as  the  first
              day  of  the  week)  using the locale's alternative


       %Ow    The number of  the  weekday  (Sunday=0)  using  the
              locale's alternative numeric symbols.

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

       %Oy    The year (offset from %C) using the locale's alter­
              native numeric symbols.

       The broken-down time structure tm is defined  in  <time.h>
       as follows:

              struct tm {
                      int     tm_sec;         /* seconds */
                      int     tm_min;         /* minutes */
                      int     tm_hour;        /* hours */
                      int     tm_mday;        /* day of the month */
                      int     tm_mon;         /* month */
                      int     tm_year;        /* year */
                      int     tm_wday;        /* day of the week */
                      int     tm_yday;        /* day in the year */
                      int     tm_isdst;       /* daylight saving time */
              };


RETURN VALUE

       The return value of the function is a pointer to the first
       character not processed in this function  call.   In  case
       the input string contains more characters than required by
       the format string the return value points right after  the
       last  consumed  input  character.  In case the whole input
       string is consumed the return value points to the NUL byte
       at  the  end  of the string.  If strptime() fails to match
       all of the format string and therefore an  error  occurred
       the function returns NULL.


CONFORMING TO

       XPG4, SUSv2, Austin draft.


GNU EXTENSIONS

       For  reasons of symmetry, glibc tries to support for strp­
       time the same format characters as for strftime.  (In most
       cases the corresponding fields are parsed, but no field in
       tm is changed.)  This leads to

       %F     Equivalent to %Y-%m-%d, the ISO 8601 date format.

       %g     The year corresponding to the ISO week number,  but
              without the century (0-99).

       %G     The year corresponding to the ISO week number. (For
              example, 1991.)

              Monday = 1).

       %V     The  ISO  8601:1988 week number as a decimal number
              (1-53).  If the week (starting on Monday)  contain­
              ing  1  January  has  four  or more days in the new
              year, then it is considered week 1.  Otherwise,  it
              is the last week of the previous year, and the next
              week is week 1.

       %z     An RFC-822/ISO 8601 standard time  zone  specifica­
              tion.

       %Z     The timezone name.

       Similarly,  because  of  GNU extensions to strftime, %k is
       accepted as a synonym for %H, and %l should be accepted as
       a  synonym for %I, and %P is accepted as a synonym for %p.
       Finally

       %s     The number of seconds since the epoch, i.e.,  since
              1970-01-01  00:00:00  UTC.   Leap  seconds  are not
              counted unless leap second support is available.


NOTES

       In principle, this function does  not  initialize  tm  but
       only  stores  the  values  specified.   This means that tm
       should be initialized before the call.  Details  differ  a
       bit  between  different Unix systems.  The GNU libc imple­
       mentation does  not  touch  those  fields  which  are  not
       explicitly   specified,  except  that  it  recomputes  the
       tm_wday and tm_yday field if any of the  year,  month,  or
       day elements changed.

       This  function is available since libc 4.6.8.  Linux libc4
       and libc5 includes define the  prototype  unconditionally;
       glibc2    includes   provide   a   prototype   only   when
       _XOPEN_SOURCE or _GNU_SOURCE are defined.

       Before libc 5.4.13 whitespace (and the 'n' and 't'  speci­
       fications) was not handled, no 'E' and 'O' locale modifier
       characters were accepted, and the 'C' specification was  a
       synonym for the 'c' specification.

       The  'y' (year in century) specification is taken to spec­
       ify a year in the 20th century by libc4 and libc5.  It  is
       taken to be a year in the range 1950-2049 by glibc 2.0. It
       is taken to be a year in 1969-2068 since glibc 2.1.


SEE ALSO

       time(2), scanf(3), setlocale(3), strftime(3)


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