29 Time library [time]

29.8 The civil calendar [time.cal]

29.8.15 Class year_month_day_last [time.cal.ymdlast]

29.8.15.2 Member functions [time.cal.ymdlast.members]

constexpr year_month_day_last(const chrono::year& y, const chrono::month_day_last& mdl) noexcept;
Effects: Initializes y_ with y and mdl_ with mdl.
constexpr year_month_day_last& operator+=(const months& m) noexcept;
Constraints: If the argument supplied by the caller for the months parameter is convertible to years, its implicit conversion sequence to years is worse than its implicit conversion sequence to months ([over.ics.rank]).
Effects: *this = *this + m.
Returns: *this.
constexpr year_month_day_last& operator-=(const months& m) noexcept;
Constraints: If the argument supplied by the caller for the months parameter is convertible to years, its implicit conversion sequence to years is worse than its implicit conversion sequence to months ([over.ics.rank]).
Effects: *this = *this - m.
Returns: *this.
constexpr year_month_day_last& operator+=(const years& y) noexcept;
Effects: *this = *this + y.
Returns: *this.
constexpr year_month_day_last& operator-=(const years& y) noexcept;
Effects: *this = *this - y.
Returns: *this.
constexpr chrono::year year() const noexcept;
Returns: y_.
constexpr chrono::month month() const noexcept;
Returns: mdl_.month().
constexpr chrono::month_day_last month_day_last() const noexcept;
Returns: mdl_.
constexpr chrono::day day() const noexcept;
Returns: If ok() is true, returns a day representing the last day of the (year, month) pair represented by *this.
Otherwise, the returned value is unspecified.
[Note 1: 
This value might be computed on demand.
— end note]
constexpr operator sys_days() const noexcept;
Returns: sys_days{year()/month()/day()}.
constexpr explicit operator local_days() const noexcept;
Returns: local_days{sys_days{*this}.time_since_epoch()}.
constexpr bool ok() const noexcept;
Returns: y_.ok() && mdl_.ok().