#include <iostream>
#include <iomanip>
#include <ctime>
#include <stdlib.h>
#include <limits>
 
int main()
{
    setenv("TZ", "/usr/share/zoneinfo/America/New_York", 1); // POSIX-specific
 
    std::time_t t = std::time(nullptr);
    std::tm tm = *std::localtime(&t);
    std::cout << "Today is           " << std::put_time(&tm, "%c %Z")
              << " and DST is " << (tm.tm_isdst ? "in effect" : "not in effect") << '\n';
    tm.tm_year = 550;
    tm.tm_year = std::numeric_limits< decltype( tm.tm_year ) >::max();
    tm.tm_mon = 88;
    tm.tm_mday = 200;
    //tm.tm_mon -= 100;  // tm_mon is now outside its normal range
    auto err = std::mktime(&tm);  // tm_dst is not set to -1; today's DST status is used
    std::cout << "100 months ago was " << std::put_time(&tm, "%c %Z")
              << " and DST was " << (tm.tm_isdst ? "in effect" : "not in effect") << '\n';
    std::cout << err << "\n";
}

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