In C++20, <chrono> has been extended by the Howard Hinant date library but some things are missing

[JUANDENT]

Hi,

Although it is nice that <chrono> has been extended, there are some functions that I haven't found after looking intensely...

For example conversion from std::chrono::sys_days to std::string should be doable by usign the new fmtlib, like so:

std::string DatePointToString( std::chrono::sys_date pt)
{
// was: auto ret = date::format("%F", pt);  //STILL WORKS as long as date.h is 
                                            //available 
// now: auto ret = std::format("%F", pt;   // DOES NOT WORK

return ret;
}

On the other direction, from string to sys_days it works like a charm:

  std::chrono::sys_days tt;
  auto ret =  std::chrono::parse("%F"s, tt);

So any thing I am missing?

Regards,
Juan

[zapshe]

//You meant:
auto ret = std::format("%F", pt);

Make sure you have the #include <format> header. If it isn't working, then your environment isn't updated with these things yet. You probably just have to wait.

[Ganado]

Might help if you give your exact compiler version so that one could lookup what C++20 features it has support for.

[seeplus]

C++ version support for the major compilers is at https://en.cppreference.com/w/cpp/compiler_support

Currently, std::format is only available with MS VS2019 16.10 (released a couple of days ago).