GETDATE(3) BSD Library Functions Manual GETDATE(3)NAME
getdate, getdate_err — convert user format date and time
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <time.h>
struct tm *
getdate(const char *str);
extern int getdate_err;
DESCRIPTION
The getdate() function converts a date or time character string pointed
to by str into a static tm structure described in tm(3).
The input string is parsed and interpreted using templates. A text file
containing templates is specified by the environment variable DATEMSK.
This should contain the full path to the template file. Lines in the
template file represent acceptable date and/or time conversion specifica‐
tions. These specifications are similar to those given for strptime(3).
The first line in the template file that matches the input string is used
to interpret and convert to internal time format.
Internal Format Conversion
The following rules apply to converting the input into the internal for‐
mat.
· If only the weekday is given, the conversion assumes today when
the weekday matches today or the first future matching weekday.
· If only the month and no year is given, the conversion assumes
the current month when the month matches or the first future
matching month. The first day of the month is assumed if no
day is given.
· If only the year is given, the values of the tm_mon, tm_mday,
tm_wday, tm_yday, and tm_isdst members of the returned struct
tm are unspecified.
· If the century is given, but the year within the century is not
given, the conversion assumes the current year.
· If no hour, minute, and second are given, the conversion
assumes the current hour, minute, and second.
· If no date is given, the conversion assumes today when the
given hour is greater than the current hour and tomorrow when
the given hour is less.
· If %Z is being scanned, then the broken-down time is based on
the the current time of the matched timezone and not the cur‐
rent runtime environment timezone.
RETURN VALUES
If successful, the getdate() function returns a pointer to a static tm
structure containing the broken-down time. Otherwise, a null pointer is
returned and getdate_err is set to indicate the error.
The variable getdate_err can have the following values:
1 DATEMSK environment variable is null or undefined.
2 Cannot open the template file for reading.
3 Get file status failed for template file.
4 Template file is not a regular file.
5 Encountered an error while reading the template file.
6 Cannot allocate memory.
7 Input string does not match any line in the template file.
8 Input string is invalid (for example February 31) or could not be
represented in a time_t.
ENVIRONMENT
DATEMSK The full path to the text file containing the templates for
acceptable date and/or time conversions.
FILES
/usr/share/examples/getdate/datemsk.template
An example template file that could be specified via the DATEMSK
environment variable.
EXAMPLES
The following example shows the possible contents of a template file:
%m
%A %B %d, %Y, %H:%M:%S
%A
%B
%m/%d/%y %I %p
%d,%m,%Y %H:%M
at %A the %dst of %B in %Y
run job at %I %p, %B %dnd
%A den %d. %B %Y %H.%M Uhr
The following are examples of valid input for the above template:
10/1/87 4 PM
Friday
Firday September 18, 1987, 10:30:30
24,9,1986 10:30
at monday the 1st of december in 1986
run job at 3 PM, december 2nd
The following examples show how local data and time specification can be
defined in the template.
Input String Line in Template
11/27/86 %m/%d/%y
27.11.86 %d.%m/%y
86-11-27 %y-%m-%d
Friday 12:00:00 %A %H:%M:%S
The following examples illustrate the Internal Format Conversion rules
given that the current date is Mon Sep 22 12:19:47 EDT 1986 and the
LC_TIME environment variable is set to the default C locale.
Input String Line in Template Date
Mon %a Mon Sep 22 12:19:47 EDT 1986
Sun %a Sun Sep 28 12:19:47 EDT 1986
Fri %a Sun Sep 26 12:19:47 EDT 1986
September %B Mon Sep 1 12:19:47 EDT 1986
January %B Thu Jan 1 12:19:47 EST 1987
December %B Mon Dec 1 12:19:47 EST 1987
Sep Mon %b %a Mon Sep 1 12:19:47 EDT 1986
Jan Fri %b %a Fri Jan 2 12:19:47 EDT 1987
Dec Mon %b %a Mon Dec 1 12:19:47 EDT 1986
Jan Wed 1989 %b %a %Y Wed Jan 4 12:19:47 EST 1989
Fri 9 %a %H Fri Sep 26 09:00:00 EDT 1986
Feb 10:30 %b %H:%S Sun Feb 1 10:00:30 EST 1987
10:30 %H:%M Tue Sep 23 10:30:00 EDT 1986
13:30 %H:%M Tue Sep 22 13:30:00 EDT 1986
SEE ALSOctime(3), localtime(3), mktime(3), strftime(3), strptime(3), time(3)STANDARDS
The getdate() function conforms to IEEE Std 1003.1-2001 (“POSIX.1”).
HISTORY
The getdate function appeared in AT&T System V Release 4 UNIX.
BUGS
The getdate interface is inherently unsafe for multi-threaded programs or
libraries, since it returns a pointer to a static variable and uses a
global state variable.
BSD April 14, 2011 BSD
