Function format_duration

src/ifcconvert/IfcConvert.cpp:1237–1255

}

std::string format_duration(time_t start, time_t end)
{
    int seconds = (int)difftime(end, start);
    std::stringstream ss;
    int minutes = seconds / 60;
    seconds = seconds % 60;
    if (minutes > 0) {
        ss << minutes << " minute";
        if (minutes == 0 || minutes > 1) {
            ss << "s";
        }
        ss << " ";
    }
    ss << seconds << " second";
    if (seconds == 0 || seconds > 1) {
        ss << "s";
    }
    return ss.str();
}

void write_log(bool header) {
	path_t log = log_stream.str();