27 Time library [time]

27.8 The civil calendar [time.cal]

27.8.9 Class month_­day [time.cal.md]

27.8.9.2 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.