30 Time library [time]

30.8 The civil calendar [time.cal]

30.8.9 Class month_day [time.cal.md]

30.8.9.2 Member functions [time.cal.md.members]

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constexpr month_day(const chrono::month& m, const chrono::day& d) noexcept;
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Effects: Initializes m_ with m, and d_ with d.
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constexpr chrono::month month() const noexcept;
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Returns: m_.
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constexpr chrono::day day() const noexcept;
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Returns: d_.
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constexpr bool ok() const noexcept;
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Returns: true if m_.ok() is true, 1d <= d_, and d_ is less than or equal to the number of days in month m_; otherwise returns false.
When m_ == February, the number of days is considered to be 29.