std::chrono::operator ==,!= (std::chrono::year_month_weekday_last)
| constexpr bool operator==(const std::chrono::year_month_weekday_last& x, 
                          const std::chrono::year_month_weekday_last& y) noexcept; | (since C++20) | |
| constexpr bool operator!=(const std::chrono::year_month_weekday_last& x, 
                          const std::chrono::year_month_weekday_last& y) noexcept; | (since C++20) | 
Compares the two year_month_weekday_last objects x and y.
Return value
1) 
 x.year() == y.year() && x.month() == y.month() && x.weekday() == y.weekday()
2) 
          !(x == y)
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