C++ 中是否有标准的日期/时间类？
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Is there a standard date/time class in C++?
提问by Farid Z
Does C++ stl have a standard time class? Or do I have to convert to c-string before writing to a stream. Example, I want to output the current date/time to a string stream:
C++ stl 有标准时间类吗？或者我是否必须在写入流之前转换为 c 字符串。例如，我想将当前日期/时间输出到字符串流：
time_t tm(); ostringstream sout; sout << tm << ends;
In this case I get the current date/time written out as a number without any formatting. I can use
c- runtime function strftimeto format tm first, but that seems like it should not be necessary if the stl has a time class that can be instantiated from time_t value
在这种情况下，我将当前日期/时间写成一个没有任何格式的数字。我可以先使用 c-runtime 函数strftime来格式化 tm，但是如果 stl 有一个可以从 time_t 值实例化的时间类，这似乎没有必要
回答by jdehaan
Not part of STL but well known library is boost.
不是 STL 的一部分，但众所周知的库是 boost。
I would go the way of using boost::date. Here are some examples: http://www.boost.org/doc/libs/1_55_0/doc/html/date_time/date_time_io.html#date_time.io_tutorial.
我会去使用的方式boost::date。以下是一些示例：http: //www.boost.org/doc/libs/1_55_0/doc/html/date_time/date_time_io.html#date_time.io_tutorial。
If you did not try out boost yet I encourage you to do so as it saves you from a lot of nasty issues, as it masks most OS dependent things like threading for example. Many things in boostare header only (template libraries). However datetime requires a lib or dll.
如果您还没有尝试使用 boost，我鼓励您这样做，因为它可以使您免于许多讨厌的问题，因为它掩盖了大多数操作系统相关的事情，例如线程。里面的很多东西boost都是头文件（模板库）。但是 datetime 需要一个 lib 或 dll。
回答by mkluwe
Nitpicking: The STL being the Standard TemplateLibrary deals with generic container and algorithms etc. and is unlikely to incorporate classes for date handling and calculation even in the future…
挑剔：作为标准模板库的 STL处理通用容器和算法等，即使在将来也不可能合并用于日期处理和计算的类......
The C++ Standard Library itself includes the STL and a previous version of the C standard library. The latter offers some date and time related functions via #include <ctime>which has already been mentioned above.
C++ 标准库本身包括 STL 和 C 标准库的早期版本。后者提供了一些与日期和时间相关的功能#include <ctime>，上面已经提到过这些功能。
If wrapping (or simply using) these functions is sufficient (and quicker) than pulling in boost, go with these. There is nothing wrong with them.
如果包装（或简单地使用）这些函数比拉入boost就足够（并且更快），请使用这些。他们没有任何问题。
回答by zahir
回答by Farid Z
OK. Here is closest I have found about directly writing time to a stream:
好的。这是我发现的关于直接将时间写入流的最接近的方法：
time_t t(time(NULL)); // current time
tm tm(*localtime(&t));
std::locale loc(""); // current user locale
ostringstream sout;
const std::time_put<TCHAR> &tput =
std::use_facet<std::time_put<TCHAR> >(loc);
tput.put(sout.rdbuf(), sout, _T('##代码##'), &tm, _T('x'));
sout << ends;
CString sTest(sout.str().c_str());
A very helpful guide is the Apache C++ Standard Library Reference Guide http://stdcxx.apache.org/doc/stdlibref/time-put.html#sec13
一个非常有用的指南是 Apache C++ 标准库参考指南 http://stdcxx.apache.org/doc/stdlibref/time-put.html#sec13
回答by bua
回答by bua
C++ now has the chrono libraries for date and time. This is documented on http://en.cppreference.com/w/cpp/chronoand http://www.cplusplus.com/reference/chrono/
C++ 现在有日期和时间的 chrono 库。这记录在http://en.cppreference.com/w/cpp/chrono和http://www.cplusplus.com/reference/chrono/
