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GETDATE(3) Linux Programmer’s Manual GETDATE(3)
NAME
getdate() - convert a string to struct tm
SYNOPSIS
#define _XOPEN_SOURCE
#define _XOPEN_SOURCE_EXTENDED
#include <time.h>
struct tm *getdate (const char *string);
extern int getdate_err;
#define _GNU_SOURCE
#include <time.h>
int getdate_r (const char *string, struct tm *res);
DESCRIPTION
The function getdate() converts a string pointed to by string into the tm structure
that it returns. This tm structure may be found in static storage, so that it will
be overwritten by the next call.
In contrast to strptime(3), (which has a format argument), getdate() uses the for-
mats found in the file of which the full path name 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 strp-
time(3). One more conversion specification is accepted:
%Z Timezone name.
When %Z is given, the value to be returned is initialised to the broken-down time
corresponding to the current time in the given time zone. Otherwise, it is ini-
tialised to the broken-down time corresponding to the current local time.
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.
RETURN VALUE
When successful, this function returns a pointer to a struct tm. Otherwise, it
returns NULL and sets the global variable getdate_err. Changes to errno are
unspecified. The following values for getdate_err are defined:
1 The DATEMSK environment variable is null or undefined.
2 The template file cannot be opened for reading.
3 Failed to get file status information.
4 The template file is not a regular file.
5 An error is 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.
NOTES
Since getdate() is not reentrant because of the use of getdate_err and the static
buffer to return the result in, glibc provides a thread-safe variant. The func-
tionality is the same. The result is returned in the buffer pointed to by res and
in case of an error the return value is nonzero with the same values as given above
for getdate_err.
The POSIX 1003.1-2001 specification for strptime() contains conversion specifica-
tions using the %E or %O modifier, while such specifications are not given for get-
date(). The glibc implementation implements getdate() using strptime() so that
automatically precisely the same conversions are supported by both.
The glibc implementation does not support the %Z conversion specification.
ENVIRONMENT
DATEMSK
File containing format patterns.
TZ, LC_TIME
Variables used by strptime().
CONFORMING TO
ISO 9899, POSIX 1003.1-2001
SEE ALSO
localtime(3), strftime(3), strptime(3), time(3)
2001-12-26 GETDATE(3)
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On Apache/1.3.41 (Unix) PHP/5.2.5 mod_perl/1.30 mod_gzip/1.3.26.1a
Under GNU General Public License
2009-01-09 09:28 @38.103.63.58 CrawledBy CCBot/1.0 (+http://www.commoncrawl.org/bot.html)