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std::chrono:: operator==,<=> (std::chrono::month_day_last)

From cppreference.net
C++
Date and time library
std::chrono::month_day_last
Defined in header <chrono>
constexpr bool operator == ( const std:: chrono :: month_day_last & x,
const std:: chrono :: month_day_last & y ) noexcept ;
(1) (since C++20)
(2) (since C++20)

Compares the two month_day_last values x and y .

The < , <= , > , >= , and != operators are synthesized from operator <=> and operator == respectively.

Return value

1) x. month ( ) == y. month ( )
2) x. month ( ) <=> y. month ( )

Example

Run this code 
#include <chrono>
#include <iostream>
int main()
{
    constexpr auto mdl1{std::chrono::February/std::chrono::last};
    constexpr std::chrono::month_day_last mdl2{std::chrono::month(2)};
    std::cout << std::boolalpha << (mdl1 == mdl2) << '\n';
    static_assert(mdl1 <= mdl2);
}

Output: 

true