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std::chrono::day::day

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

Constructs a day object.

1) Default constructor leaves the day value uninitialized.
2) If d <= 255, constructs a day object holding the day value d. Otherwise the value held is unspecified.

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