std::chrono::month::month - std::chrono::month::month
month() = default; (1) (since C++20)
explicit constexpr month(unsigned m) noexcept; (2) (since
C++20)
Constructs a month object.
1) Default constructor leaves the month value uninitialized.
2) If m <= 255, constructs a month object holding the month value m.
Otherwise the
value held is unspecified.