纪元以来字符串使用升压时间 [英] time since epoch to string using boost

问题描述

auto timeSinceEpoch = boost::chrono::duration_cast<boost::chrono::microseconds>(boost::chrono::steady_clock::now().time_since_epoch()).count();

boost::posix_time::ptime now(boost::gregorian::date(1970, 1, 1), boost::posix_time::microsec(static_cast<std::int64_t>(timeSinceEpoch)));

std::string str = boost::posix_time::to_iso_string(now);

输出： 19700114T232422.133653 这是不正确，我在做什么错

Output : 19700114T232422.133653 which it is incorrect, what am I doing wrong ?

推荐答案

在某些系统中，steady_clock的时代是自启动纳秒。

On some systems, the epoch of steady_clock is nanoseconds since boot.

您将获得更多有用的预期结果与其他设备：

You will get a more useful expected result with other clocks:

<大骨节病> 住在Coliru

#include <boost/date_time/gregorian/gregorian.hpp>
#include <boost/date_time/posix_time/posix_time.hpp>
#include <boost/chrono.hpp>
#include <string>
#include <iostream>

int main()
{
    boost::posix_time::ptime const time_epoch(boost::gregorian::date(1970, 1, 1));

    auto ms = (boost::posix_time::microsec_clock::local_time() - time_epoch).total_microseconds();
    std::cout << "microseconds: " << ms << "\n";

    boost::posix_time::ptime now = time_epoch + boost::posix_time::microseconds(ms);
    std::cout << boost::posix_time::to_iso_string(now);
}

打印

microseconds: 1415115992000000
20141104T154632

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