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#### Overview <a id="time.cal.md.overview">[[time.cal.md.overview]]</a>
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``` cpp
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namespace std::chrono {
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class month_day {
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chrono::month m_; // exposition only
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chrono::day d_; // exposition only
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public:
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month_day() = default;
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constexpr month_day(const chrono::month& m, const chrono::day& d) noexcept;
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constexpr chrono::month month() const noexcept;
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constexpr chrono::day day() const noexcept;
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constexpr bool ok() const noexcept;
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};
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}
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```
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`month_day` represents a specific day of a specific month, but with an
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unspecified year. `month_day` meets the *Cpp17EqualityComparable* (
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[[cpp17.equalitycomparable]]) and *Cpp17LessThanComparable* (
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[[cpp17.lessthancomparable]]) requirements.
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`month_day` is a trivially copyable and standard-layout class type.
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