27 Time library [time]

27.8 The civil calendar [time.cal]

27.8.16 Class year_­month_­weekday [time.cal.ymwd]

27.8.16.2 Member functions [time.cal.ymwd.members]

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constexpr year_month_weekday(const chrono::year& y, const chrono::month& m, const chrono::weekday_indexed& wdi) noexcept;
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Effects: Initializes y_­ with y, m_­ with m, and wdi_­ with wdi.
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constexpr year_month_weekday(const sys_days& dp) noexcept;
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Effects: Constructs an object of type year_­month_­weekday which corresponds to the date represented by dp.
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Remarks: For any value ymdl of type year_­month_­weekday for which ymdl.ok() is true, ymdl == year_­month_­weekday{sys_­days{ymdl}} is true.
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constexpr explicit year_month_weekday(const local_days& dp) noexcept;
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Effects: Equivalent to constructing with sys_­days{dp.time_­since_­epoch()}.
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constexpr year_month_weekday& operator+=(const months& m) 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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Effects: *this = *this + m.
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Returns: *this.
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constexpr year_month_weekday& operator-=(const months& m) 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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Effects: *this = *this - m.
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Returns: *this.
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constexpr year_month_weekday& operator+=(const years& y) noexcept;
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Effects: *this = *this + y.
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Returns: *this.
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constexpr year_month_weekday& operator-=(const years& y) noexcept;
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Effects: *this = *this - y.
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Returns: *this.
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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 chrono::weekday weekday() const noexcept;
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Returns: wdi_­.weekday().
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constexpr unsigned index() const noexcept;
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Returns: wdi_­.index().
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constexpr chrono::weekday_indexed weekday_indexed() const noexcept;
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Returns: wdi_­.
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constexpr operator sys_days() const noexcept;
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Returns: If y_­.ok() && m_­.ok() && wdi_­.weekday().ok(), returns a sys_­days that represents the date (index() - 1) * 7 days after the first weekday() of year()/month().
If index() is 0 the returned sys_­days represents the date 7 days prior to the first weekday() of year()/month().
Otherwise the returned value is unspecified.
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constexpr explicit operator local_days() const noexcept;
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Returns: local_­days{sys_­days{*this}.time_­since_­epoch()}.
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constexpr bool ok() const noexcept;
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Returns: If any of y_­.ok(), m_­.ok(), or wdi_­.ok() is false, returns false.
Otherwise, if *this represents a valid date, returns true.
Otherwise, returns false.