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std::chrono::year_month_day_last::year, std::chrono::year_month_day_last::month, std::chrono::year_month_day_last::day, std::chrono::year_month_day_last::month_day_last

From cppreference.com
 
 
Utilities library
Language support
Type support (basic types, RTTI)
Library feature-test macros (C++20)
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Program utilities
Coroutine support (C++20)
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(C++26)
Three-way comparison
(C++20)
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General utilities
Date and time
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Formatting library (C++20)
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Relational operators (deprecated in C++20)
Integer comparison functions
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(C++23)
Elementary string conversions
(C++17)
(C++17)

 
 
 
constexpr std::chrono::year year() const noexcept;
(1) (since C++20)
constexpr std::chrono::month month() const noexcept;
(2) (since C++20)
constexpr std::chrono::day day() const noexcept;
(3) (since C++20)
constexpr std::chrono::month_day_last month_day_last() const noexcept;
(4) (since C++20)

Retrieves the field values stored in this year_month_day_last object.

[edit] Return value

1) Returns the stored std::chrono::year value.
2) Returns the stored std::chrono::month value.
3) A std::chrono::day value corresponding to the last day of the stored year and month. If this->ok() is false, the return value is unspecified.
4) A std::chrono::month_day_last constructed from month().

[edit] Example

#include <chrono>
 
int main()
{
    constexpr auto ymdl{std::chrono::last/11/2020};
    static_assert
    (
        ymdl.day() == std::chrono::day(30) &&
        ymdl.month() == std::chrono::November &&
        ymdl.year() == std::chrono::year(2020) &&
        ymdl.month_day_last() == std::chrono::November/std::chrono::last
    );
}