NAME

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 (1) (since C++20)
) noexcept;
constexpr std::chrono::day& operator-=( const std::chrono::days& d (2) (since C++20)
) noexcept;

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

// Run this code

#include <cassert>
#include <chrono>

int main()
{
std::chrono::day d {15};

d += std::chrono::days(2);
assert(d == std::chrono::day(17));

d -= std::chrono::days{3};
assert(d == std::chrono::day(14));
}

See also

operator++
operator++(int) increments or decrements the day
operator-- (public member function)
operator--(int)
operator+ adds or subtracts a number of days and a day, or find the difference
operator- between two days
(C++20) (function)