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GETDATE(3)			    Linux Programmer's Manual			       GETDATE(3)

NAME
       getdate, getdate_r - convert a date-plus-time string to broken-down time

SYNOPSIS
       #include <time.h>

       struct tm *getdate(const char *string);

       extern int getdate_err;

       #include <time.h>

       int getdate_r(const char *string, struct tm *res);

   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

       getdate():
	   _XOPEN_SOURCE >= 500 || _XOPEN_SOURCE && _XOPEN_SOURCE_EXTENDED
       getdate_r():
	   _GNU_SOURCE

DESCRIPTION
       The  function  getdate() converts a string representation of a date and time, contained in
       the buffer pointed to by string, into a broken-down time.  The broken-down time is  stored
       in  a  tm  structure,  and a pointer to this structure is returned as the function result.
       This tm structure is allocated in static storage, and consequently it will be  overwritten
       by further calls to getdate().

       In  contrast  to  strptime(3),  (which  has a format argument), getdate() uses the formats
       found in the file whose full pathname is given in the environment variable  DATEMSK.   The
       first line in the file that matches the given input string is used for the conversion.

       The matching is done case insensitively.  Superfluous whitespace, either in the pattern or
       in the string to be converted, is ignored.

       The conversion specifications that a pattern can contain are those given for  strptime(3).
       One more conversion specification is specified in POSIX.1-2001:

       %Z     Timezone name.  This is not implemented in glibc.

       When %Z is given, the structure containing the broken-down time is initialized with values
       corresponding to the current time in the given timezone.  Otherwise, the structure is ini-
       tialized  to the broken-down time corresponding to the current local time (as by a call to
       localtime(3)).

       When only the weekday is given, the day is taken to be the first  such  day  on	or  after
       today.

       When  only the month is given (and no year), the month is taken to be the first such month
       equal to or after the current month.  If no day is given, it  is  the  first  day  of  the
       month.

       When no hour, minute and second are given, the current hour, minute and second are taken.

       If  no  date  is given, but we know the hour, then that hour is taken to be the first such
       hour equal to or after the current hour.

       getdate_r() is a GNU extension that provides a reentrant  version  of  getdate().   Rather
       than  using  a  global  variable to report errors and a static buffer to return the broken
       down time, it returns errors via the function result value, and returns the resulting bro-
       ken-down time in the caller-allocated buffer pointed to by the argument res.

RETURN VALUE
       When  successful,  getdate() returns a pointer to a struct tm.  Otherwise, it returns NULL
       and sets the global variable getdate_err to one of the error numbers shown below.  Changes
       to errno are unspecified.

       On  success  getdate_r()  returns  0;  on  error it returns one of the error numbers shown
       below.

ERRORS
       The following errors are returned via getdate_err  (for	getdate())  or	as  the  function
       result (for getdate_r()):

       1   The DATEMSK environment variable is not defined, or its value is an empty string.

       2   The template file specified by DATEMSK cannot be opened for reading.

       3   Failed to get file status information.

       4   The template file is not a regular file.

       5   An error was encountered while reading the template file.

       6   Memory allocation failed (not enough memory available).

       7   There is no line in the file that matches the input.

       8   Invalid input specification.

ENVIRONMENT
       DATEMSK
	      File containing format patterns.

       TZ, LC_TIME
	      Variables used by strptime(3).

ATTRIBUTES
   Multithreading (see pthreads(7))
       The getdate() function is not thread-safe.

       The getdate_r() function is thread-safe.

CONFORMING TO
       POSIX.1-2001.

NOTES
       The  POSIX.1-2001  specification  for strptime(3) contains conversion specifications using
       the %E or %O modifier, while such specifications are not given for getdate().   In  glibc,
       getdate()  is  implemented  using  strptime(3), so that precisely the same conversions are
       supported by both.

EXAMPLE
       The program below calls getdate() for each of its command-line  arguments,  and	for  each
       call  displays the values in the fields of the returned tm structure.  The following shell
       session demonstrates the operation of the program:

	   $ TFILE=$PWD/tfile
	   $ echo '%A' > $TFILE       # Full weekday name
	   $ echo '%T' >> $TFILE      # ISO date (YYYY-MM-DD)
	   $ echo '%F' >> $TFILE      # Time (HH:MM:SS)
	   $ date
	   $ export DATEMSK=$TFILE
	   $ ./a.out Tuesday '2009-12-28' '12:22:33'
	   Sun Sep  7 06:03:36 CEST 2008
	   Call 1 ("Tuesday") succeeded:
	       tm_sec	= 36
	       tm_min	= 3
	       tm_hour	= 6
	       tm_mday	= 9
	       tm_mon	= 8
	       tm_year	= 108
	       tm_wday	= 2
	       tm_yday	= 252
	       tm_isdst = 1
	   Call 2 ("2009-12-28") succeeded:
	       tm_sec	= 36
	       tm_min	= 3
	       tm_hour	= 6
	       tm_mday	= 28
	       tm_mon	= 11
	       tm_year	= 109
	       tm_wday	= 1
	       tm_yday	= 361
	       tm_isdst = 0
	   Call 3 ("12:22:33") succeeded:
	       tm_sec	= 33
	       tm_min	= 22
	       tm_hour	= 12
	       tm_mday	= 7
	       tm_mon	= 8
	       tm_year	= 108
	       tm_wday	= 0
	       tm_yday	= 250
	       tm_isdst = 1

   Program source

       #define _GNU_SOURCE 500
       #include <time.h>
       #include <stdio.h>
       #include <stdlib.h>

       int
       main(int argc, char *argv[])
       {
	   struct tm *tmp;
	   int j;

	   for (j = 1; j < argc; j++) {
	       tmp = getdate(argv[j]);

	       if (tmp == NULL) {
		   printf("Call %d failed; getdate_err = %d\n",
			  j, getdate_err);
		   continue;
	       }

	       printf("Call %d (\"%s\") succeeded:\n", j, argv[j]);
	       printf("    tm_sec   = %d\n", tmp->tm_sec);
	       printf("    tm_min   = %d\n", tmp->tm_min);
	       printf("    tm_hour  = %d\n", tmp->tm_hour);
	       printf("    tm_mday  = %d\n", tmp->tm_mday);
	       printf("    tm_mon   = %d\n", tmp->tm_mon);
	       printf("    tm_year  = %d\n", tmp->tm_year);
	       printf("    tm_wday  = %d\n", tmp->tm_wday);
	       printf("    tm_yday  = %d\n", tmp->tm_yday);
	       printf("    tm_isdst = %d\n", tmp->tm_isdst);
	   }

	   exit(EXIT_SUCCESS);
       }

SEE ALSO
       time(2), localtime(3), setlocale(3), strftime(3), strptime(3)

COLOPHON
       This page is part of release 3.55 of the Linux man-pages project.  A  description  of  the
       project,     and    information	  about    reporting	bugs,	 can	be    found    at
       http://www.kernel.org/doc/man-pages/.

					    2013-06-21				       GETDATE(3)
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