tmp/tmpbmtripe5/{from.md → to.md}
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#### Overview <a id="time.cal.month.overview">[[time.cal.month.overview]]</a>
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``` cpp
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namespace std::chrono {
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class month {
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unsigned char m_; // exposition only
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public:
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month() = default;
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constexpr explicit month(unsigned m) noexcept;
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constexpr month& operator++() noexcept;
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constexpr month operator++(int) noexcept;
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constexpr month& operator--() noexcept;
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constexpr month operator--(int) noexcept;
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constexpr month& operator+=(const months& m) noexcept;
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constexpr month& operator-=(const months& m) noexcept;
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constexpr explicit operator unsigned() const 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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`month` represents a month of a year. It normally holds values in the
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range 1 to 12, but may hold non-negative values outside this range. It
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can be constructed with any `unsigned` value, which will be subsequently
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truncated to fit into `month`’s unspecified internal storage. `month`
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meets the *Cpp17EqualityComparable* ([[cpp17.equalitycomparable]]) and
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*Cpp17LessThanComparable* ([[cpp17.lessthancomparable]]) requirements,
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and participates in basic arithmetic with `months` objects, which
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represent a difference between two `month` objects.
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`month` is a trivially copyable and standard-layout class type.
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