30 Time library [time]

30.8 The civil calendar [time.cal]

30.8.13 Class year_month [time.cal.ym]

30.8.13.2 Member functions [time.cal.ym.members]

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constexpr year_month(const chrono::year& y, const chrono::month& m) noexcept;
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Effects: Initializes y_ with y, and m_ with m.
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constexpr chrono::year year() const noexcept;
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Returns: y_.
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constexpr chrono::month month() const noexcept;
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Returns: m_.
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constexpr year_month& operator+=(const months& dm) noexcept;
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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]).
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Returns: *this.
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constexpr year_month& operator-=(const months& dm) noexcept;
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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]).
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Returns: *this.
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constexpr year_month& operator+=(const years& dy) noexcept;
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Returns: *this.
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constexpr year_month& operator-=(const years& dy) noexcept;
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Returns: *this.
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constexpr bool ok() const noexcept;
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Returns: y_.ok() && m_.ok().

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