25 Time library [time]

25.8 The civil calendar [time.cal]

25.8.15 Class year_­month_­day_­last [time.cal.ymdlast]

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

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constexpr bool operator==(const year_month_day_last& x, const year_month_day_last& y) noexcept;
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Returns: x.year() == y.year() && x.month_­day_­last() == y.month_­day_­last().
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constexpr bool operator<(const year_month_day_last& x, const year_month_day_last& y) noexcept;
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Returns: If x.year() < y.year(), returns true.
Otherwise, if x.year() > y.year(), returns false.
Otherwise, returns 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;
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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;
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Returns: ymdl + dm.
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constexpr year_month_day_last operator-(const year_month_day_last& ymdl, const months& dm) noexcept;
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Returns: ymdl + (-dm).
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constexpr year_month_day_last operator+(const year_month_day_last& ymdl, const years& dy) noexcept;
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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;
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Returns: ymdl + dy.
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constexpr year_month_day_last operator-(const year_month_day_last& ymdl, const years& dy) noexcept;
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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);
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Returns: os << ymdl.year() << '/' << ymdl.month_­day_­last().