30 Time library [time]

30.8 The civil calendar [time.cal]

30.8.6 Class weekday [time.cal.wd]

30.8.6.2 Member functions [time.cal.wd.members]

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constexpr explicit weekday(unsigned wd) noexcept;
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Effects: Initializes wd_ with wd == 7 ? 0 : wd.
The value held is unspecified if wd is not in the range [0, 255].
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constexpr weekday(const sys_days& dp) noexcept;
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Effects: Computes what day of the week corresponds to the sys_days dp, and initializes that day of the week in wd_.
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[Example 1: 
If dp represents 1970-01-01, the constructed weekday represents Thursday by storing 4 in wd_.
— end example]
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constexpr explicit weekday(const local_days& dp) noexcept;
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Effects: Computes what day of the week corresponds to the local_days dp, and initializes that day of the week in wd_.
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Postconditions: The value is identical to that constructed from sys_days{dp.time_since_epoch()}.
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constexpr weekday& operator++() noexcept;
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Effects: *this += days{1}.
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Returns: *this.
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constexpr weekday operator++(int) noexcept;
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Effects: ++(*this).
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Returns: A copy of *this as it existed on entry to this member function.
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constexpr weekday& operator--() noexcept;
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Effects: *this -= days{1}.
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Returns: *this.
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constexpr weekday operator--(int) noexcept;
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Effects: --(*this).
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Returns: A copy of *this as it existed on entry to this member function.
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constexpr weekday& operator+=(const days& d) noexcept;
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Effects: *this = *this + d.
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Returns: *this.
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constexpr weekday& operator-=(const days& d) noexcept;
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Effects: *this = *this - d.
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Returns: *this.
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constexpr unsigned c_encoding() const noexcept;
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Returns: wd_.
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constexpr unsigned iso_encoding() const noexcept;
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Returns: wd_ == 0u ? 7u : wd_.
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constexpr bool ok() const noexcept;
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Returns: wd_ <= 6.
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constexpr weekday_indexed operator[](unsigned index) const noexcept;
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Returns: {*this, index}.
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constexpr weekday_last operator[](last_spec) const noexcept;
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Returns: weekday_last{*this}.