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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 timeSYNOPSIS¶
#include <time.h>Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
_XOPEN_SOURCE >= 500 ||
_XOPEN_SOURCE && _XOPEN_SOURCE_EXTENDED
_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().- %Z
- Timezone name. This is not implemented in glibc.
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.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).
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 3.44 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/.2010-09-20 |