如何使用boost将datetime格式化为string？ [英] How to format a datetime to string using boost?

问题描述

从当前日期/时间开始：

  ptime now = second_clock :: universal_time（）; 
  

，最后以包含以下格式的日期/时间的wstring：

 ％Y％m％d_％H％M％S 
  

你能告诉我代码来实现吗？谢谢。

解决方案

对于任何值得的，这里是我写的这个功能：

  #includeboost / date_time / posix_time / posix_time.hpp
 #include< iostream> 
 #include< sstream> 
 
 std :: wstring FormatTime（boost :: posix_time :: ptime now）
 {
使用命名空间boost :: posix_time; 
 static std :: locale loc（std :: wcout.getloc（），
 new wtime_facet（L％Y％m％d_％H％M％S））; 
 
 std :: basic_stringstream< wchar_t> wss; 
 wss.imbue（loc）; 
 wss<<<现在; 
 return wss.str（）; 
} 
 
 int main（）{
 using namespace boost :: posix_time; 
 ptime now = second_clock :: universal_time（）; 
 
 std :: wstring ws（FormatTime（now））; 
 std :: wcout<<< ws< std :: endl; 
 sleep（2）; 
 now = second_clock :: universal_time（）; 
 ws = FormatTime（now）; 
 std :: wcout<<< ws< std :: endl; 
 
} 
  

此程序的输出是：

  20111130_142732 
 20111130_142734 
  

我发现这些链接很有用：

• 如何格式化格式为dd / mm / yyyy的日期时间对象


• http://www.boost.org/doc/libs/ 1_35_0 / doc / html / date_time / date_time_io.html＃date_time.time_facet


• http://www.cplusplus.com/reference/iostream/stringstream/str/

I want to format a date/time to a string using boost.

Starting with the current date/time:

ptime now = second_clock::universal_time();

and ending up with a wstring containing the date/time in this format:

%Y%m%d_%H%M%S

Can you show me the code to achieve this? Thanks.

解决方案

For whatever it is worth, here is the function that I wrote to do this:

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

std::wstring FormatTime(boost::posix_time::ptime now)
{
  using namespace boost::posix_time;
  static std::locale loc(std::wcout.getloc(),
                         new wtime_facet(L"%Y%m%d_%H%M%S"));

  std::basic_stringstream<wchar_t> wss;
  wss.imbue(loc);
  wss << now;
  return wss.str();
}

int main() {
  using namespace boost::posix_time;
  ptime now = second_clock::universal_time();

  std::wstring ws(FormatTime(now));
  std::wcout << ws << std::endl;
  sleep(2);
  now = second_clock::universal_time();
  ws = FormatTime(now);
  std::wcout << ws << std::endl;

}

The output of this program was:

20111130_142732
20111130_142734

I found these links useful:

• How to format date time object with format dd/mm/yyyy?
• http://www.boost.org/doc/libs/1_35_0/doc/html/date_time/date_time_io.html#date_time.time_facet
• http://www.cplusplus.com/reference/iostream/stringstream/str/

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