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

< cpp‎ | chrono‎ | day
Utilities library
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Date and time
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Formatting library (C++20)
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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;.


[edit] Return value

A reference to this day after modification.

[edit] Notes

If the result would be outside the range [0255], the actual stored value is unspecified.

[edit] Example

#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

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