Nanoseconds & RFC3339 Timestamp C++

main.cpp

#include "date.h"
#include <chrono>
#include <ctime>
#include <iostream>
#include <sstream>

typedef struct _timestamp_struct {
    int64_t unixtime_ns;
    std::string rfc3339;
} TimestampData;

void print_timestamp(const TimestampData *timestamp) {
    std::cout << "Current RFC3339 Timestamp    : " << timestamp->rfc3339 << "\n";
    std::cout << "Current Unixtime Nanoseconds : " << timestamp->unixtime_ns << "\n";
}

void get_current_timestamp(TimestampData *timestamp) {
    using namespace std::chrono;
    using namespace date;
    const auto current_time = system_clock::now();

    timestamp->unixtime_ns = duration_cast<std::chrono::nanoseconds>(current_time.time_since_epoch()).count();
    timestamp->rfc3339 = format("%FT%TZ", time_point_cast<nanoseconds>(current_time));
}

int32_t main() {
    TimestampData timestamp;
    get_current_timestamp(&timestamp);
    print_timestamp(&timestamp);
}

Using Howard Hinnant's date.h

❯ clang++ main.cpp -Wall -Wextra -O3 -march=native -std=gnu++17 -o get_unixtime_ns && ./get_unixtime_ns 
Current RFC3339 Timestamp    : 2019-11-16T05:10:38.742105610Z
Current Unixtime Nanoseconds : 1573881038742105610