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Message-ID: <5398FB90.7000109@sbcglobal.net>
Date: Wed, 11 Jun 2014 21:00:00 -0400
From: bfdamkoehler <bfdamkoehler@...global.net>
To: musl@...ts.openwall.com
Subject: Re: REG_STARTEND (regex)
Hello,
I noticed an issue with localtime() in musl-1.1.2. In my environment TZ
is set to EST5EDT. There is a test program below that demonstrates this.
localtime() is returning with isdst == 1 for for a time_t value of
1394327858 (08-Mar-14 20:17). Daylight savings time starts on 09-Mar-14.
Note that if you decrement the time_t value in the test program isdst
remains set.
This time_t value is the st_atime value of a file on my machine, as
returned by stat64().
Just as further test I moved the file around to an AIX 5.2 machine, HPUX
11.11, and OpenBSD 5.0 system and a Centos 6.5 linux machine. I used ls
and tar on them to display the file date and they all came out as
08-Mar-14 20:17, as does the output from my application if it is linked
with the gcc libc. When my application is linked with musl it produces a
time of 08-Mar-14 21:17.
I just wanted to mention that I had noticed this.
Bruce
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <time.h>
int main()
{
time_t bin_time = 1394327858; /* should be 08-Mar-14
20:17 but */
/* localtime returns
isdst=1 so */
/* it is 08-Mar-14
21:17 */
struct tm *tm_ptr;
char *cptr;
//#define GO_BACK_N_DAYS_IN_TIME
#ifdef GO_BACK_N_DAYS_IN_TIME
bin_time = 1394327858 - ( (24 * 60 * 60) * 60);
#endif
cptr = getenv("TZ");
if( cptr == NULL )
printf("the TZ environment variable is not defined\n");
else
printf("the TZ environment variable is set to %s\n", cptr);
tm_ptr = localtime(&bin_time);
printf("The local time is ...\n");
printf("\t\ttm_sec ........... %d\n", tm_ptr->tm_sec);
printf("\t\ttm_min ........... %d\n", tm_ptr->tm_min);
printf("\t\ttm_hour .......... %d\n", tm_ptr->tm_hour);
printf("\t\ttm_mday .......... %d\n", tm_ptr->tm_mday);
printf("\t\ttm_mon ........... %d\n", tm_ptr->tm_mon);
printf("\t\ttm_year .......... %d\n", tm_ptr->tm_year);
printf("\t\ttm_wday .......... %d\n", tm_ptr->tm_wday);
printf("\t\ttm_yday .......... %d\n", tm_ptr->tm_yday);
printf("\t\ttm_is_dst......... %d\n", tm_ptr->tm_isdst);
printf("\n\n");
printf("tm_hour should be 20 and tm_is_dst should be 0 -- DST
starts on 09-Mar-14.\n");
printf("\n\n");
}
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