std::chrono::day::operator+=,std::chrono::day::operator-= (3) Linux Manual Page

std::chrono::day::operator+=,std::chrono::day::operator-= – std::chrono::day::operator+=,std::chrono::day::operator-=

Synopsis

constexpr std::chrono::day &operator+=(const std::chrono::days &d) noexcept;
(1)(since C++ 20)

    constexpr std::chrono::day &
    operator-=(const std::chrono::days &d) noexcept; (2) (since C++20)
Adds or subtracts d.count() days from the day value.

1) Equivalent to *this = *this + d;

2) Equivalent to *this = *this - d;

Return value

A reference to this day after modification

Notes

If the result would be outside the range [0, 255], the actual stored value is unspecified.

Example

 This section is incomplete
 Reason: no example

See also

operator++ increments or decrements the day
operator++(int) (public member function)
operator–
operator–(int)
                adds or subtracts a number of days and a day, or find the difference between two days
operator+ (function)
operator-