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<p>Thank you Paul and Zefram.</p>
<p>Well my bad i missed to update the code with seconds while
calling localtime.</p>
<p>Even after that things didn't work for me.</p>
<p><u>Code</u></p>
<p> cat test_tz_simple.c <br>
<font size="-1" face="Courier New, Courier, monospace">#include
<stdlib.h><br>
#include <string.h><br>
#include <time.h><br>
#include <syslog.h><br>
<br>
#include <sys/time.h> /* clude defn. of gettimeofday */<br>
#include <sys/types.h><br>
<br>
<br>
int main()<br>
{<br>
u_int64_t time = 0;<br>
struct timeval tv;<br>
struct tm *tm;<br>
int gmtoff, gmtoff_hr, gmtoff_min;<br>
char *gmtoff_sign;<br>
<br>
if ( gettimeofday(&tv, NULL) == 0)<br>
{<br>
time = (long long) tv.tv_sec;<br>
<br>
}<br>
<br>
<b>tm = localtime(&tv.tv_sec);</b><br>
printf ("epoch:%lld, %lld-%02d-%02d %02d:%02d:%02d gmtoff: %ld,
TZ: %s\n",<br>
time, tm->tm_year + 1900LL, tm->tm_mon + 1,
tm->tm_mday,<br>
tm->tm_hour, tm->tm_min, tm->tm_sec,<br>
tm->tm_gmtoff, tm->tm_zone);<br>
<br>
if ( tm->tm_gmtoff < 0 )<br>
{<br>
gmtoff = (0 - tm->tm_gmtoff );<br>
gmtoff_sign = "-";<br>
}<br>
else<br>
{<br>
gmtoff = tm->tm_gmtoff;<br>
gmtoff_sign = "+";<br>
}<br>
gmtoff_hr = gmtoff/3600;<br>
gmtoff_min = gmtoff/60 - gmtoff_hr*60;<br>
<br>
printf("Time: %04d-%02d-%02d %02d:%02d:%02d.%03d %s%02d%02d \n",<br>
(tm->tm_year + 1900),
tm->tm_mon+1, tm->tm_mday,<br>
tm->tm_hour, tm->tm_min,
tm->tm_sec, time,<br>
gmtoff_sign, gmtoff_hr, gmtoff_min);<br>
<br>
} <br>
</font></p>
<p><br>
<font size="-1" face="Courier New, Courier, monospace"></font><br>
<br>
</p>
<p>Regarding setting TZ variable , we use customized linux platform.
The way time zone is set is as follows</p>
<p><font size="-1" face="Courier New, Courier, monospace">$ cat
/etc/sysconfig/clock <br>
UTC=true<br>
ARC=false<br>
ZONE=Asia/Manila</font></p>
<p><font size="-1" face="Courier New, Courier, monospace">$ls -ltr
/etc/localtime <br>
lrwxrwxrwx 1 root root 31 Oct 26 12:31 /etc/localtime ->
/usr/share/zoneinfo/Asia/Manila</font><br>
</p>
<p>I tried export TZ=Asia/Manila before running a.out. But no luck.</p>
<p>surprisingly, when i copy back 2016g version of tzdb binary,
a.out gives correct result.</p>
<p><font size="-1" face="Courier New, Courier, monospace">$ cksum
/usr/share/zoneinfo/Asia/Manila_2016 <br>
2614106258 319 /usr/share/zoneinfo/Asia/Manila_2016</font></p>
<p><br>
<u>Output with 2016g tzdb </u><br>
</p>
<p><font size="-1" face="Courier New, Courier, monospace">$ ./a.out
<br>
epoch:1509609002, 2017-11-02 15:50:02 gmtoff: 28800, TZ: PHT<br>
Time: 2017-11-02 15:50:02.1509609002 +0800 <br>
$ <br>
</font></p>
<p><font size="-1" face="Courier New, Courier, monospace">$ cksum
/usr/share/zoneinfo/Asia/Manila_2017 <br>
2995436782 311 /usr/share/zoneinfo/Asia/Manila_2017</font></p>
<p><br>
<u>Output with 2017a tzdb </u></p>
<p><font size="-1" face="Courier New, Courier, monospace">$./a.out</font>
</p>
<p><font size="-1" face="Courier New, Courier, monospace">epoch:1509608903,
2017-11-02 07:48:23 gmtoff: 0, TZ: <br>
Time: 2017-11-02 07:48:23.1509608903 +0000 </font></p>
In fact recompiling 2017 tzdb replacing <font color="#d04437"><b>+08/+09
</b><font color="#000000">by PH%sT for last row results in correct
output.<br>
<br>
Please advice. <br>
<br>
Thanks & Regards,<br>
Arati<br>
<br>
</font></font><br>
<div class="moz-cite-prefix">On Thursday 02 November 2017 03:01 AM,
Paul Eggert wrote:<br>
</div>
<blockquote type="cite"
cite="mid:a455ffe1-80f8-9d70-8d5c-9e573ea2666d@cs.ucla.edu">On
11/01/2017 01:12 PM, Zefram wrote:
<br>
<blockquote type="cite">localtime() operates on a time_t, the
value of
<br>
which you need to get from time() or from the .tv_sec part of
what you
<br>
get from gettimeofday(). Instead you've taken a correct .tv_sec
and
<br>
multiplied it by 1000. Instead of asking about November 2017
you've
<br>
asked about October 49804. A zero offset is still not what the
tzdb
<br>
projects for 49804, but localtime() can be forgiven for giving
up.
<br>
</blockquote>
<br>
Although that is indeed a problem with the program, I suspect that
there's some other issue as well. I just now compiled and ran the
following simpler variant of the program on Fedora 26 x86-64
(64-bit long and time_t), linked to the current tzdb code and
data:
<br>
<br>
#include <time.h>
<br>
#include <stdio.h>
<br>
int
<br>
main (void)
<br>
{
<br>
time_t time = 1509521131510;
<br>
long long ltime = time;
<br>
struct tm *tm = localtime (&time);
<br>
printf ("epoch:%lld, %lld-%02d-%02d %02d:%02d:%02d gmtoff: %ld,
TZ: %s\n",
<br>
ltime, tm->tm_year + 1900LL, tm->tm_mon + 1,
tm->tm_mday,
<br>
tm->tm_hour, tm->tm_min, tm->tm_sec,
<br>
tm->tm_gmtoff, tm->tm_zone);
<br>
return 0;
<br>
}
<br>
<br>
With the TZ environment variable set to "Asia/Manila", it outputs
the expected value:
<br>
<br>
epoch:1509521131510, 49804-10-27 17:25:10 gmtoff: 28800, TZ: +08
<br>
<br>
With the TZ environment variable unset, it outputs:
<br>
<br>
epoch:1509521131510, 49804-10-27 09:25:10 gmtoff: 0, TZ: GMT
<br>
<br>
which are the reported symptoms. But the latter output is also
correct, since the default wall-clock time, if you just install
tzdb without any special configuration and do not set TZ, is the
same as if you had set TZ="GMT0".
<br>
<br>
<br>
</blockquote>
<br>
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