std::chrono::time_point<Clock,Duration>::operator++, std::chrono::time_point<Clock,Duration>::operator--

std::chrono::time_point<Clock,Duration>::operator++, std::chrono::time_point<Clock,Duration>::operator-- - cppreference.com

From cppreference.com

`constexpr time_point& operator++();`	(1)	(since C++20)
`constexpr time_point operator++( int );`	(2)	(since C++20)
`constexpr time_point& operator--();`	(3)	(since C++20)
`constexpr time_point operator--( int );`	(4)	(since C++20)

Modifies the point in time *this represents by one tick of the duration.

If d_ is a member variable holding the duration (i.e., time since epoch) of this time_point object,

1) Equivalent to ++d_; return *this;.

2) Equivalent to return time_point(d_++).

3) Equivalent to --d_; return *this;.

4) Equivalent to return time_point(d_--);.

(none)

1,3) A reference to this time_point after modification.

2,4) A copy of the time_point made before modification.