29 Time library [time]

29.8 The civil calendar [time.cal]

29.8.16 Class year_month_weekday [time.cal.ymwd]

29.8.16.3 Non-member functions [time.cal.ymwd.nonmembers]

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

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

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constexpr year_month_weekday operator+(const year_month_weekday& ymwd, 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: (ymwd.year() / ymwd.month() + dm) / ymwd.weekday_indexed().

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constexpr year_month_weekday operator+(const months& dm, const year_month_weekday& ymwd) noexcept;

Returns: ymwd + dm.

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constexpr year_month_weekday operator-(const year_month_weekday& ymwd, const months& dm) noexcept;

Returns: ymwd + (-dm).

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constexpr year_month_weekday operator+(const year_month_weekday& ymwd, const years& dy) noexcept;

Returns: {ymwd.year()+dy, ymwd.month(), ymwd.weekday_indexed()}.

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constexpr year_month_weekday operator+(const years& dy, const year_month_weekday& ymwd) noexcept;

Returns: ymwd + dy.

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constexpr year_month_weekday operator-(const year_month_weekday& ymwd, const years& dy) noexcept;

Returns: ymwd + (-dy).

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template<class charT, class traits>
  basic_ostream<charT, traits>&
    operator<<(basic_ostream<charT, traits>& os, const year_month_weekday& ymwd);

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