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

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day (C++20)
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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)

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constexprstd::chrono::day& operator+=(conststd::chrono::days& d)noexcept;	(1)	(since C++20)
constexprstd::chrono::day& operator-=(conststd::chrono::days& d)noexcept;	(2)	(since C++20)

Adds or subtractsd.count() days from the day value.

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

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

[edit]Return value

A reference to thisday 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`day`s (function)[edit]

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

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