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std::chrono::month:: operator unsigned

From cppreference.net
C++
Date and time library
std::chrono::month
constexpr explicit operator unsigned ( ) const noexcept ;
(desde C++20)

Devuelve el valor del mes almacenado en * this .

Valor de retorno

El valor del mes almacenado en * this .

Ejemplo

Ejecutar este código 
#include <chrono>
#include <iostream>
int main()
{
    constexpr std::chrono::month m{6};
    constexpr unsigned p = static_cast<unsigned>(m);
    constexpr unsigned q = static_cast<unsigned>(std::chrono::September);
    std::cout << "The month is: " << p << '\n'
              << "September is: " << q << '\n'; 
}

Salida: 

The month is: 6
September is: 9