std::chrono::day::day

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C-style date and time

day()=default;	(1)	(since C++20)
constexprexplicit day(unsigned d)noexcept;	(2)	(since C++20)

Constructs aday object.

1) Default constructor leaves the day value uninitialized.

2) Ifd<=255, constructs aday object holding the day valued. Otherwise the value held is unspecified.

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