[Bug libstdc++/113500] Using std::format with float or double based std::chrono::time_point causes error: no match for 'operator<<'

[redi at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113500

--- Comment #8 from Jonathan Wakely <redi at gcc dot gnu.org> ---
I am testing a patch that allows writing floating-point utc_time, gps_time etc.
with any format string, and allows writing floating-point sys_time with a
non-empty spec.