https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=192016
Bug ID: 192016
Summary: Incorrect result for %s in strftime
Product: Base System
Version: 10.0-STABLE
Hardware: Any
OS: Any
Status: Needs Triage
Severity: Affects Many People
Priority: ---
Component: bin
Assignee: freebsd-bugs@FreeBSD.org
Reporter: q...@daurnimator.com
The %s specifier in strftime doesn't respect timezones.
Example:
#include <time.h>
#include <stdio.h>
int main() {
time_t t = 1234567890;
struct tm *tmp = gmtime(&t);
char output[200];
strftime(output, 200, "%s", tmp);
printf("%s\n",output);
return 0;
}
Run with a non UTC timezone. e.g. TZ=GMT+9
Output will be 1234600290 instead of expected 1234567890
Location in BSD's libc:
https://svnweb.freebsd.org/base/release/10.0.0/lib/libc/stdtime/strftime.c?view=markup#l312
This bug also exists in glibc:
http://fossies.org/dox/glibc-2.19/strftime__l_8c_source.html#l01133
Bug filed at https://sourceware.org/bugzilla/show_bug.cgi?id=17189
It does not occur in musl:
http://git.musl-libc.org/cgit/musl/tree/src/time/strftime.c?id=ac0acd569e01735fc6052d43fdf57f3a07c93f3d#n127
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