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

From cppreference.com
 
 
Utilities library
General utilities
Date and time
Function objects
Formatting library (C++20)
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Relational operators (deprecated in C++20)
Integer comparison functions
(C++20)(C++20)(C++20)   
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Swap and type operations
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Common vocabulary types
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Elementary string conversions
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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 values

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(ymd.day() == std::chrono::day(1));
 }