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

int main() {
    time_t now = time(NULL);
    struct tm local_time;
    struct tm *temp;
    char default_buffer[100];
    char ny_buffer[100];
    char tokyo_buffer[100];
    
    // Get default time zone
    temp = localtime(&now);
    if (temp == NULL) return 1;
    local_time = *temp;
    strftime(default_buffer, sizeof(default_buffer), "%Y-%m-%d %H:%M:%S %Z", &local_time);
    
    // Change to New York time
    setenv("TZ", "America/New_York", 1);
    tzset();
    
    temp = localtime(&now);
    if (temp == NULL) return 1;
    local_time = *temp;
    strftime(ny_buffer, sizeof(ny_buffer), "%Y-%m-%d %H:%M:%S %Z", &local_time);
    
    // Change to Tokyo time
    setenv("TZ", "Asia/Tokyo", 1);
    tzset();
    
    temp = localtime(&now);
    if (temp == NULL) return 1;
    local_time = *temp;
    strftime(tokyo_buffer, sizeof(tokyo_buffer), "%Y-%m-%d %H:%M:%S %Z", &local_time);
    
    // Now print all three (safe - each has its own buffer)
    printf("Default:    %s\n", default_buffer);
    printf("New York:   %s\n", ny_buffer);
    printf("Tokyo:      %s\n", tokyo_buffer);
    
    return 0;
}