std::chrono::operator+,std::chrono::operator-(std::chrono::year_month_weekday_last)(3)

NAME
std::chrono::operator+,std::chrono::operator-(std::chrono::year_month_weekday_last) - std::chrono::operator+,std::chrono::operator-(std::chrono::year_month_weekday_last)

Synopsis
   constexpr std::chrono::year_month_weekday_last
       operator+( const std::chrono::year_month_weekday_last& ymwdl, (since C++20)
                  const std::chrono::months& dm ) noexcept;
   constexpr std::chrono::year_month_weekday_last
       operator+( const std::chrono::months& dm, (since C++20)
                  const std::chrono::year_month_weekday_last& ymwdl )
   noexcept;
   constexpr std::chrono::year_month_weekday_last
       operator+( const std::chrono::year_month_weekday_last& ymwdl, (since C++20)
                  const std::chrono::years& dy ) noexcept;
   constexpr std::chrono::year_month_weekday_last
       operator+( const std::chrono::years& dy, (since C++20)
                  const std::chrono::year_month_weekday_last& ymwdl )
   noexcept;
   constexpr std::chrono::year_month_weekday_last
       operator-( const std::chrono::year_month_weekday_last& ymwdl, (since C++20)
                  const std::chrono::months& dm ) noexcept;
   constexpr std::chrono::year_month_weekday_last
       operator-( const std::chrono::year_month_weekday_last& ymwdl, (since C++20)
                  const std::chrono::years& dy ) noexcept;
   1,2) Adds dm.count() months to the date represented by ymwdl. The result has the
   same year() and month() as std::chrono::year_month(ymwdl.year(), ymwdl.month()) + dm
   and the same weekday() as ymwdl.
   3,4) Adds dy.count() years to the date represented by ymwdl. The result is
   equivalent to std::chrono::year_month_weekday_last(ymwdl.year() + dy, ymwdl.month(),
   ymwd.weekday_last()).
   5) Subtracts dm.count() months from the date represented by ymwdl. Equivalent to
   ymwdl + -dm.
   6) Subtracts dy.count() years from the date represented by ymwdl. Equivalent to
   ymwdl + -dy.
   For durations that are convertible to both std::chrono::years and
   std::chrono::months, the years overloads (3,4,6) are preferred if the call would
   otherwise be ambiguous.

Example
// Run this code
 #include <cassert>
 #include <chrono>
 using namespace std::chrono;
 int main()
 {
     constexpr auto ymwdl1{Tuesday[last]/11/2021};
     auto ymwdl2 = ymwdl1;
     ymwdl2 = std::chrono::months(12) + ymwdl2;
     ymwdl2 = ymwdl2 - std::chrono::years(1);
     assert(ymwdl1 == ymwdl2);
 }