TZ env var test

README.md

cc -o test test.c

Then compare

strace -Ttt ./test

with

TZ=:/etc/localtime strace -Ttt TZ=:/etc/localtime

test.c

#include <time.h>
#include <stdio.h>

int
main(int argc, char *argv[])
{
        int i = 0;
        time_t timep;

        printf("Greetings!\n");

        for(i = 0; i < 10; i++) {
                time(&timep);
                localtime(&timep);
        }

        printf("Bye, bye!\n");
        return 0;
}