std::chrono::operator==,<=>(std::chrono::day)

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constexpr bool operator==( const std::chrono::day& x, const std::chrono::day& y ) noexcept;	(1)	(C++20 起)
constexpr std::strong_ordering operator<=>( const std::chrono::day& x, const std::chrono::day& y ) noexcept;	(2)	(C++20 起)

比较二个 std::chrono::day x 和 y 。

1) unsigned(x) == unsigned(y)

2) unsigned(x) <=> unsigned(y)

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