c – 无法将std :: string转换为日期类型

#include "date.h"
#include <string>
#include <iostream>
#include <sstream>

int main()
{
  std::string d = "2016-11-23";
  std::istringstream in{d};
  date::sys_days sd;
  date::parse(in,"%F",sd);
  date::year_month_day ymd = sd;
  std::cout << ymd << 'n';
}

并且收到太多错误抱怨’const class std :: time_get< char>‘没有名为’get’的成员

In file included from convert_string_to_date.cpp:1:0:
date.h: In instantiation of ‘void date::detail::parse(std::basic_istream<_CharT,_Traits>&,const std::basic_string<CharT,Traits>&,date::local_time<Duration>&,std::basic_string<CharT,Traits>*,std::chrono::minutes*) [with CharT = char; Traits = std::char_traits<char>; Duration = std::chrono::duration<int,std::ratio<86400l,1l> >; date::local_time<Duration> = std::chrono::time_point<date::local_t,std::chrono::duration<int,1l> > >; std::chrono::minutes = std::chrono::duration<long int,std::ratio<60l> >]’:
date.h:4371:90:   required from ‘void date::detail::parse(std::basic_istream<_CharT,std::ratio<60l> >]’
date.h:4447:42:   required from ‘void date::parse(std::basic_istream<_CharT,date::sys_time<Duration>&) [with CharT = char; Traits = std::char_traits<char>; Duration = std::chrono::duration<int,1l> >; date::sys_time<Duration> = std::chrono::time_point<std::chrono::_V2::system_clock,1l> > >]’
date.h:4649:59:   required from ‘void date::parse(std::basic_istream<_CharT,const CharT*,1l> > >]’
convert_string_to_date.cpp:12:27:   required from here
date.h:4192:21: error: ‘const class std::time_get<char>’ has no member named ‘get’
                     f.get(is,is,err,&tm,b,i-1);
                     ^
date.h:4197:25: error: ‘const class std::time_get<char>’ has no member named ‘get’
                         f.get(is,ymd,ymd+8);
                         ^
date.h:4211:21: error: ‘const class std::time_get<char>’ has no member named ‘get’
                     f.get(is,i-1);
                     ^
date.h:4221:25: error: ‘const class std::time_get<char>’ has no member named ‘get’
                         f.get(is,hm,hm+6);
                         ^
date.h:4266:25: error: ‘const class std::time_get<char>’ has no member named ‘get’
                         f.get(is,hm+2);
                         ^
date.h:4275:21: error: ‘const class std::time_get<char>’ has no member named ‘get’
                     f.get(is,i-1-modified);
                     ^
date.h:4322:21: error: ‘const class std::time_get<char>’ has no member named ‘get’
                     f.get(is,i-1);
                     ^
date.h:4343:17: error: ‘const class std::time_get<char>’ has no member named ‘get’
                 f.get(is,e);