View source for cpp/chrono/year month day last/operator arith 2

===Example===
{{example
|code=
#include <cassert>
#include <chrono>
#include <iostream>

int main()
{
    auto ymdl{11/std::chrono::last/2020};
    std::cout << ymdl << '\n';

    ymdl = std::chrono::years(10) + ymdl;
    std::cout << ymdl << '\n';
    assert(ymdl == std::chrono::day(30)/
                   std::chrono::November/
                   std::chrono::year(2030));

    ymdl = ymdl - std::chrono::months(6);
    std::cout << ymdl << '\n';
    assert(ymdl == std::chrono::day(31)/
                   std::chrono::May/
                   std::chrono::year(2030));
}
|output=
2020/Nov/last
2030/Nov/last
2030/May/last
}}

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