問(wèn)題描述

我正在使用 Azure REST API，他們正在使用它來(lái)創(chuàng)建表存儲(chǔ)的請(qǐng)求正文:

I'm working with the Azure REST API and they are using this to create the request body for table storage:

DateTime.UtcNow.ToString("o")

產(chǎn)生:

2012-03-02T04:07:34.0218628Z

2012-03-02T04:07:34.0218628Z

它被稱為往返"，顯然它是一個(gè) ISO 標(biāo)準(zhǔn)(參見(jiàn) http://en.wikipedia.org/wiki/ISO_8601) 但我不知道如何在閱讀 wiki 文章后復(fù)制它.

It is called "round-trip" and apparently it's an ISO standard (see http://en.wikipedia.org/wiki/ISO_8601) but I have no idea how to replicate it after reading the wiki article.

有誰(shuí)知道 Boost 是否支持這個(gè)，或者可能 Qt?

Does anyone know if Boost has support for this, or possibly Qt?

推薦答案

如果到最接近秒的時(shí)間足夠精確，可以使用strftime:

If the time to the nearest second is precise enough, you can use strftime:

#include <ctime>
#include <iostream>

int main() {
    time_t now;
    time(&now);
    char buf[sizeof "2011-10-08T07:07:09Z"];
    strftime(buf, sizeof buf, "%FT%TZ", gmtime(&now));
    // this will work too, if your compiler doesn't support %F or %T:
    //strftime(buf, sizeof buf, "%Y-%m-%dT%H:%M:%SZ", gmtime(&now));
    std::cout << buf << "
";
}

如果您需要更高的精度，可以使用 Boost:

If you need more precision, you can use Boost:

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

int main() {
    using namespace boost::posix_time;
    ptime t = microsec_clock::universal_time();
    std::cout << to_iso_extended_string(t) << "Z
";
}

這篇關(guān)于如何在 C++ 中構(gòu)建 ISO 8601 日期時(shí)間?的文章就介紹到這了，希望我們推薦的答案對(duì)大家有所幫助，也希望大家多多支持html5模板網(wǎng)！