[Bug libstdc++/121929] std::format prints a valid-looking date for invalid 2020y/January/Friday[10]

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=121929

Jonathan Wakely <redi at gcc dot gnu.org> changed:

           What    |Removed                     |Added
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           Severity|normal                      |minor