30 Time library [time]

30.8 The civil calendar [time.cal]

30.8.17 Class year_month_weekday_last [time.cal.ymwdlast]

30.8.17.3 Non-member functions [time.cal.ymwdlast.nonmembers]

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

Returns: x.year() == y.year() && x.month() == y.month() && x.weekday_last() == y.weekday_last()

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constexpr year_month_weekday_last
  operator+(const year_month_weekday_last& ymwdl, 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: (ymwdl.year() / ymwdl.month() + dm) / ymwdl.weekday_last().

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constexpr year_month_weekday_last
  operator+(const months& dm, const year_month_weekday_last& ymwdl) noexcept;

Returns: ymwdl + dm.

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constexpr year_month_weekday_last
  operator-(const year_month_weekday_last& ymwdl, const months& dm) noexcept;

Returns: ymwdl + (-dm).

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constexpr year_month_weekday_last
  operator+(const year_month_weekday_last& ymwdl, const years& dy) noexcept;

Returns: {ymwdl.year()+dy, ymwdl.month(), ymwdl.weekday_last()}.

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constexpr year_month_weekday_last
  operator+(const years& dy, const year_month_weekday_last& ymwdl) noexcept;

Returns: ymwdl + dy.

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constexpr year_month_weekday_last
  operator-(const year_month_weekday_last& ymwdl, const years& dy) noexcept;

Returns: ymwdl + (-dy).

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template<class charT, class traits>
  basic_ostream<charT, traits>&
    operator<<(basic_ostream<charT, traits>& os, const year_month_weekday_last& ymwdl);

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