tmp/tmp__y0_b67/{from.md → to.md}
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#### Overview <a id="time.cal.ym.overview">[[time.cal.ym.overview]]</a>
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``` cpp
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namespace std::chrono {
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class year_month {
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chrono::year y_; // exposition only
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chrono::month m_; // exposition only
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public:
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year_month() = default;
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constexpr year_month(const chrono::year& y, const chrono::month& m) noexcept;
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constexpr chrono::year year() const noexcept;
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constexpr chrono::month month() const noexcept;
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constexpr year_month& operator+=(const months& dm) noexcept;
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constexpr year_month& operator-=(const months& dm) noexcept;
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constexpr year_month& operator+=(const years& dy) noexcept;
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constexpr year_month& operator-=(const years& dy) noexcept;
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constexpr bool ok() const noexcept;
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};
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}
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```
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`year_month` represents a specific month of a specific year, but with an
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unspecified day. `year_month` is a field-based time point with a
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resolution of `months`. `year_month` meets the *Cpp17EqualityComparable*
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([[cpp17.equalitycomparable]]) and *Cpp17LessThanComparable* (
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[[cpp17.lessthancomparable]]) requirements.
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`year_month` is a trivially copyable and standard-layout class type.
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