我如何构建在C ++中ISO 8601日期时间? [英] How do I construct an ISO 8601 datetime in C++?
问题描述
我的Azure的REST API工作,他们利用这种创建表的存储请求体:
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")
主要生产:
2012-03-02T04:07:34.0218628Z
2012-03-02T04:07:34.0218628Z
这就是所谓的往返,显然这是一个ISO标准(见 http://en.wikipedia.org/wiki / ISO_8601 ),但我不知道如何阅读维基文章后,复制它。
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.
有谁知道,如果提升已经支持这一点,或者可能的 Qt的?
Does anyone know if Boost has support for this, or possibly Qt?
请注意:我会比较它与C#后,周末送还给你。
Note: I'll get back to you after the weekend after comparing it to C#.
推荐答案
如果时间精确到秒为precise的话,你可以使用的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 << "\n";
}
如果您需要更多的precision,你可以使用升压:
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\n";
}
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