Three ways to get UTC time in C++

1. C++ way:

#include <ctime>

std::string currentDateTimeUTC( )

{

    struct tm tm;

    std::time_t time = std::time(nullptr);

    if (gmtime_s(&tm, &time))

        return ("");

    char utc[_countof("1970-01-01T00:00:00")];

    strftime(utc, _countof(utc), "%Y-%m-%dT%H:%M:%S", &tm);

    return (utc);

}

auto result = currentDateTimeUTC( );

2. boost way:

#include <boost/date_time/posix_time/posix_time.hpp>

using namespace boost::posix_time;

auto result = to_iso_extended_string(second_clock::universal_time());

3. Qt way:

#include <QDateTime>

auto result = QDateTime::currentDateTimeUtc().toString(Qt::ISODate).toStdString();