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It outputs:
SAST
LMT
LMT
An equivalent C program to the first test:
"""
#include <time.h>
#include <stdlib.h>
#include <stdio.h>
int main() {
 time_t t;
 struct tm *tmp;
 t = time(NULL);
 tmp = localtime(&t);
 char str[200];
 strftime(str, sizeof(str), "%Z", tmp);
 puts(str);
 struct tm tmp2;
 tmp2.tm_sec = 0;
 tmp2.tm_min = 0;
 tmp2.tm_hour = 0;
 tmp2.tm_mday = 1;
 tmp2.tm_mon = 1;
 tmp2.tm_year = -1;
 tmp2.tm_wday = -1;
 tmp2.tm_yday = -1;
 tmp2.tm_isdst = -1;
 mktime(&tmp2);
 t = time(NULL);
 tmp = localtime(&t);
 strftime(str, sizeof(str), "%Z", tmp);
 puts(str);
 return 0;
}
"""
Outputs (as expected):
SAST
SAST
Perhaps it's not mktime?