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Showing content from https://en.cppreference.com/w/cpp/language/../algorithm/../ranges/../../cpp/chrono/c/gmtime.html below:

std::gmtime - cppreference.com

Converts given time since epoch as std::time_t value into calendar time, expressed in Coordinated Universal Time (UTC).

Pointer to a static internal std::tm object on success, or null pointer otherwise. The structure may be shared between std::gmtime, std::localtime, and std::ctime and may be overwritten on each invocation.

This function may not be thread-safe.

POSIX requires that gmtime sets errno to EOVERFLOW if it fails because the argument is too large.

#include <ctime>
#include <iomanip>
#include <iostream>
#include <sstream>
 
int main()
{
    setenv("TZ", "/usr/share/zoneinfo/Europe/London", 1); // POSIX-specific
 
    std::tm tm{}; // get_time does not set all fields hence {}
    tm.tm_year = 2020 - 1900; // 2020
    tm.tm_mon = 7 - 1; // July
    tm.tm_mday = 15; // 15th
    tm.tm_hour = 10;
    tm.tm_min = 15;
    tm.tm_isdst = 1; // Daylight saving in London
    std::time_t t = std::mktime(&tm); 
 
    std::cout << "UTC:   " << std::put_time(std::gmtime(&t), "%c %Z") << '\n';
    std::cout << "local: " << std::put_time(std::localtime(&t), "%c %Z") << '\n';
}

Possible output:

UTC:   Wed Jul 15 09:15:00 2020 GMT
local: Wed Jul 15 10:15:00 2020 BST

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