C ++库（unix）解析日期/时间字符串包括时区 [英] C++ library (unix) to parse date/time string Including timezones

问题描述

我有一些格式的日期。
现在我想有一个函数（从一些库）在c ++中，可以解析这些日期/时间字符串，并给我一些结构，像一个tm或转换成一些确定性的表示，使我可以玩日期/时间。

I have dates in a bunch of formats. Now i would like to have a function (from some library) in c++ that can parse these date/time string and give me some structure like a tm or convert them to some deterministic representation so that i can play around with the date/time.

我看到的一些格式如下：
Tue，19 Feb 2008 20:47:53 +0530
Tue， 28 Apr 2009 18:22:39 -0700（PDT）

Some formats that I see are as follows : Tue, 19 Feb 2008 20:47:53 +0530 Tue, 28 Apr 2009 18:22:39 -0700 (PDT)

我可以做那些没有时区，但对于那些与时区，我基本上需要库在tm结构中将其转换为UTC。

I am able to do the ones without the timezones but for the ones with the timezone, i basically need the library to convert it to UTC in the tm structure.

我试过boost和strptime，但据我所知，两者都不支持时区的输入。有没有什么我错过了？

I have tried boost and strptime, but as far as i know, both do no support timezones on inputs. is there anything that i have missed?

任何对此的帮助将非常感激。

ANy help on this one will be really appreciated.

/ p>

Regards

推荐答案

您可以通过boost来做到这一点，但它对输入字符串中的时区格式有些特别。它必须在 POSIX时间区域格式。

You can do that with boost, but it's a little particular about the format of time zones in the input string. It has to be in POSIX time zone format.

例如：

#include <iostream>
#include <boost/date_time/local_time/local_time.hpp>
#include <boost/date_time/time_facet.hpp>
int main()
{
       std::string msg = "28 Apr 2009 18:22:39 PST-8PDT,M4.1.0,M10.1.0"; // or just "PDT-7" but that will be a new, fake time zone called 'PDT'

       std::istringstream ss(msg);
       ss.imbue( std::locale(ss.getloc(),
                 new boost::local_time::local_time_input_facet("%d %b %Y %H:%M:%S%F %ZP")));
       boost::local_time::local_date_time t(boost::date_time::pos_infin);
       ss >> t;
       std::cout << t << '\n';
       // and now you can call t.to_tm() to get your tm structure
}

我会添加一些预处理来将您的时区格式转换为posix格式，然后提供字符串boost。

I would add some sort of pre-processing to convert your time zone formats to posix format, and then feed the strings to boost.

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