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

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chrono I/O
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C-style date and time
std::chrono::year_month_weekday_last
constexpr std::chrono::year_month_weekday_last

operator+ ( const std::chrono::year_month_weekday_last & ymwdl,

const std::chrono::months & dm ) noexcept ;
(since C++20)
constexpr std::chrono::year_month_weekday_last

operator+ ( const std::chrono::months & dm,

const std::chrono::year_month_weekday_last & ymwdl ) noexcept ;
(since C++20)
constexpr std::chrono::year_month_weekday_last

operator+ ( const std::chrono::year_month_weekday_last & ymwdl,

const std::chrono::years & dy ) noexcept ;
(since C++20)
constexpr std::chrono::year_month_weekday_last

operator+ ( const std::chrono::years & dy,

const std::chrono::year_month_weekday_last & ymwdl ) noexcept ;
(since C++20)
constexpr std::chrono::year_month_weekday_last

operator- ( const std::chrono::year_month_weekday_last & ymwdl,

const std::chrono::months & dm ) noexcept ;
(since C++20)
constexpr std::chrono::year_month_weekday_last

operator- ( const std::chrono::year_month_weekday_last & ymwdl,

const std::chrono::years & dy ) noexcept ;
(since C++20)
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 ( ) ) + 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)

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);
}
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