26 Time library [time]

26.8 The civil calendar [time.cal]

26.8.13 Class year_­month [time.cal.ym]

26.8.13.2 Member functions [time.cal.ym.members]

constexpr year_month(const chrono::year& y, const chrono::month& m) noexcept;
Effects: Constructs an object of type year_­month by initializing y_­ with y, and m_­ with m.
constexpr chrono::year year() const noexcept;
Returns: y_­.
constexpr chrono::month month() const noexcept;
Returns: m_­.
constexpr year_month& operator+=(const months& dm) noexcept;
Effects: *this = *this + dm.
Returns: *this.
constexpr year_month& operator-=(const months& dm) noexcept;
Effects: *this = *this - dm.
Returns: *this.
constexpr year_month& operator+=(const years& dy) noexcept;
Effects: *this = *this + dy.
Returns: *this.
constexpr year_month& operator-=(const years& dy) noexcept;
Effects: *this = *this - dy.
Returns: *this.
constexpr bool ok() const noexcept;
Returns: y_­.ok() && m_­.ok().