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Showing content from https://en.cppreference.com/w/cpp/language/../algorithm/../../cpp/chrono/day/operator_arith.html below:

std::chrono::day::operator+=, std::chrono::day::operator-= - cppreference.com

C++ Compiler support Freestanding and hosted Language Standard library Standard library headers Named requirements Feature test macros (C++20) Language support library Concepts library (C++20) Diagnostics library Memory management library Metaprogramming library (C++11) General utilities library Containers library Iterators library Ranges library (C++20) Algorithms library Strings library Text processing library Numerics library Date and time library Input/output library Filesystem library (C++17) Concurrency support library (C++11) Execution control library (C++26) Technical specifications Symbols index External libraries [edit] Date and time library Time point time_point

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C-style date and time [edit] std::chrono::day Member functions day::day day::operator++day::operator--

day::operator+=day::operator-=

day::operator unsigned day::ok Nonmember functions operator==operator<=> operator+operator- operator<< from_stream operator""d Helper classes formatter<std::chrono::day> hash<std::chrono::day>

(C++26)

[edit] 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;.

Contents

[edit] Return value

A reference to this day after modification.

[edit] Notes

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

[edit] 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));
}
[edit] See also operator++operator++(int)operator--operator--(int) increments or decrements the day
(public member function) [edit] operator+operator-

(C++20)

adds or subtracts a number of days and a day, or find the difference between two days
(function) [edit]

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