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* [Bug libc/15100] New: strptime conversion error for %W
@ 2013-02-05 11:38 seanp_oriordain at yahoo dot com
2013-06-05 8:34 ` [Bug libc/15100] " schwab@linux-m68k.org
2014-06-13 18:54 ` fweimer at redhat dot com
0 siblings, 2 replies; 3+ messages in thread
From: seanp_oriordain at yahoo dot com @ 2013-02-05 11:38 UTC (permalink / raw)
To: glibc-bugs
http://sourceware.org/bugzilla/show_bug.cgi?id=15100
Bug #: 15100
Summary: strptime conversion error for %W
Product: glibc
Version: 2.15
Status: NEW
Severity: normal
Priority: P2
Component: libc
AssignedTo: unassigned@sourceware.org
ReportedBy: seanp_oriordain@yahoo.com
CC: drepper.fsp@gmail.com
Classification: Unclassified
%W returns incorrect answers
The code here:
#define _XOPEN_SOURCE
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
int
main (void)
{
struct tm tm;
char buf[255];
memset (&tm, 0, sizeof (struct tm));
// ok what week number is the 1st of January 2012?
// according to this it is week 01 in %U format
// and 00 in %W format...
strptime ("2012-01-01 01:00", "%Y-%m-$d %H:%M", &tm);
strftime (buf, sizeof (buf), "%Y-%m-%d %U %W %a %b %H:%M", &tm);
puts("To demonstrate the different week numbers in %U %W");
puts("Using format %Y-%m-%d %U %W %a %b %H:%M");
puts (buf);
// to demonstrate it works
strptime ("2012 02 Sun 01 00", "%Y %W %a %H %M", &tm);
strftime (buf, sizeof (buf), "%Y-%m-%d %a %b %H %M", &tm);
puts("\nUsing format %Y-%m-%d %a %b %H%M for 2012 02 Sun 01 00");
puts (buf);
// but then the potential bug...
strptime ("2012 01 Sun 01 00", "%Y %W %a %H %M", &tm);
strftime (buf, sizeof (buf), "%Y-%m-%d %a %b %H %M", &tm);
puts("\nUsing format %Y-%m-%d %a %b %H%M for 2012 01 Sun 01 00");
puts("and this is wrong...");
puts (buf);
strptime ("2012 00 Sun 01 00", "%Y %W %a %H %M", &tm);
strftime (buf, sizeof (buf), "%Y-%m-%d %a %b %H %M", &tm);
puts("\nUsing format %Y-%m-%d %a %b %H %M for 2012 00 Sun 01 00");
puts("and this is VERY wrong...");
puts (buf);
exit (EXIT_SUCCESS);
}
generates the following:
To demonstrate the different week numbers in %U %W
Using format %Y-%m-%d %U %W %a %b %H:%M
2012-01-00 01 00 Sun Jan 00:00
Using format %Y-%m-%d %a %b %H%M for 2012 02 Sun 01 00
2012-01-08 Sun Jan 01 00
Using format %Y-%m-%d %a %b %H%M for 2012 01 Sun 01 00
and this is wrong...
2012-01-01 Sun Jan 01 00
Using format %Y-%m-%d %a %b %H %M for 2012 00 Sun 01 00
and this is VERY wrong...
2012-00--371 Sun Saturday 01 00
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^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2014-06-13 18:54 UTC | newest]
Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed)
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2013-02-05 11:38 [Bug libc/15100] New: strptime conversion error for %W seanp_oriordain at yahoo dot com
2013-06-05 8:34 ` [Bug libc/15100] " schwab@linux-m68k.org
2014-06-13 18:54 ` fweimer at redhat dot com
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