29 Time library [time]

29.8 The civil calendar [time.cal]

29.8.15 Class year_month_day_last [time.cal.ymdlast]

29.8.15.3 Non-member functions [time.cal.ymdlast.nonmembers]

constexpr bool operator==(const year_month_day_last& x, const year_month_day_last& y) noexcept;

Returns: x.year() == y.year() && x.month_day_last() == y.month_day_last().

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constexpr strong_ordering operator<=>(const year_month_day_last& x,
                                      const year_month_day_last& y) noexcept;

Effects: Equivalent to: if (auto c = x.year() <=> y.year(); c != 0) return c; return x.month_day_last() <=> y.month_day_last();

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constexpr year_month_day_last
  operator+(const year_month_day_last& ymdl, const months& dm) 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]).

Returns: (ymdl.year() / ymdl.month() + dm) / last.

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constexpr year_month_day_last
  operator+(const months& dm, const year_month_day_last& ymdl) noexcept;

Returns: ymdl + dm.

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constexpr year_month_day_last
  operator-(const year_month_day_last& ymdl, const months& dm) noexcept;

Returns: ymdl + (-dm).

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constexpr year_month_day_last
  operator+(const year_month_day_last& ymdl, const years& dy) noexcept;

Returns: {ymdl.year()+dy, ymdl.month_day_last()}.

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constexpr year_month_day_last
  operator+(const years& dy, const year_month_day_last& ymdl) noexcept;

Returns: ymdl + dy.

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constexpr year_month_day_last
  operator-(const year_month_day_last& ymdl, const years& dy) noexcept;

Returns: ymdl + (-dy).

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template<class charT, class traits>
  basic_ostream<charT, traits>&
    operator<<(basic_ostream<charT, traits>& os, const year_month_day_last& ymdl);

Effects: Equivalent to: return os << format(os.getloc(), STATICALLY-WIDEN<charT>("{}/{:L}"), ymdl.year(), ymdl.month_day_last());