std::chrono::year_month_day::year, std::chrono::year_month_day::month, std::chrono::year_month_day::day

Utilities library
Language support
Type support (basic types, RTTI)
Library feature-test macros (C++20)
Dynamic memory management
Program utilities
Coroutine support (C++20)
Variadic functions
Debugging support
Three-way comparison
General utilities
Date and time
Function objects
Formatting library (C++20)
Relational operators (deprecated in C++20)
Integer comparison functions
Swap and type operations
Common vocabulary types
Elementary string conversions

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)

Retrieves the year, month and day values stored in this year_month_day object.

[edit] Return value

1) Returns the stored std::chrono::year value.
2) Returns the stored std::chrono::month value.
3) Returns the stored std::chrono::day value.

[edit] Example

#include <chrono>
int main()
    constexpr std::chrono::year_month_day ymd{std::chrono::July/1/2021};
    static_assert(ymd.year() == std::chrono::year(2021));
    static_assert(ymd.month() == std::chrono::month(7));
    static_assert( == std::chrono::day(1));