strptime

       ture

SYNOPSIS
       #define _XOPEN_SOURCE       /* See feature_test_macros(7) */
       #include <time.h>

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

DESCRIPTION
       The strptime() function is the converse  function  to  strftime(3)  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  format is a character string that consists of field
       descriptors 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  charac-
       ters  in  the format string must have a matching character in the input
       string, except for whitespace, which matches zero  or  more  whitespace
       characters  in  the  input string.  There should be whitespace or other
       alphanumeric characters between any two field descriptors.

       The strptime() function processes the input string from left to  right.
       Each of the three possible input elements (whitespace, literal, or for-
       mat) 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 compari-
       son is case insensitive.  In case a number is to  be  matched,  leading
       zeros are permitted 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).

       %d or %e
              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).

       %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 behavior is
              undefined.

       %R     Equivalent to %H:%M.

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

       %t     Arbitrary whitespace.

       %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 twen-
              tieth  century  (1969-1999);  values in the range 00-68 refer to
              years in the twenty-first century (2000-2068).

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

       Some field descriptors can be modified by the E or O  modifier  charac-
       ters  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 representation.

       %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 rep-
              resentation.

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

       %Ow    The number of the weekday (Sunday=0) using the locale's alterna-
              tive 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 alternative 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 null byte
       at the end of the string.  If strptime() fails to match all of the for-
       mat string and therefore an error occurred the function returns NULL.

CONFORMING TO
       SUSv2, POSIX.1-2001.

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  glibc
       implementation  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.
       since glibc 2.1.

   Glibc Notes
       For reasons of symmetry, glibc tries to support for strptime() the same
       format characters as for strftime(3).  (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.)

       %u     The day of the week as a decimal number (1-7, where Monday = 1).

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

       %z     An RFC-822/ISO 8601 standard timezone specification.

       %Z     The timezone name.

       Similarly, because of GNU extensions to strftime(3), %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, 1970-01-01 00:00:00 +0000
              (UTC).   Leap seconds are not counted unless leap second support
              is available.

       The glibc implementation does not require whitespace between two  field
       descriptors.

EXAMPLE
       The  following  example  demonstrates  the  use of strptime() and strf-
       time(3).

       #define _XOPEN_SOURCE
       #include <stdio.h>
       #include <stdlib.h>
       #include <string.h>
       #include <time.h>

       int
       main(void)
       {
           struct tm tm;
           char buf[255];

       description  of  the project, and information about reporting bugs, can
       be found at http://man7.org/linux/man-pages/.



GNU                               2009-12-05                       STRPTIME(3)
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