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std::chrono::operator+, std::chrono::operator- (std::chrono::day) - cppreference.com

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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]

Defined in header

<chrono> constexpr std::chrono::day operator+( const std::chrono::day&  d,
                                      const std::chrono::days& ds ) noexcept; (1) (since C++20) constexpr std::chrono::day operator+( const std::chrono::days& ds,
                                      const std::chrono::day&  d ) noexcept; (2) (since C++20) constexpr std::chrono::day operator-( const std::chrono::day&  d,
                                      const std::chrono::days& ds ) noexcept; (3) (since C++20) constexpr std::chrono::days operator-( const std::chrono::day& x,
                                       const std::chrono::day& y ) noexcept; (4) (since C++20)

1,2) Adds ds.count() days to d.

3) Subtracts ds.count() days from d.

4) Calculate the difference, in days, between two day x and y.

Contents

[edit] Return value 1,2) std::chrono::day(unsigned(d) + ds.count()) 3) std::chrono::day(unsigned(d) - ds.count()) 4) std::chrono::days(int(unsigned(x)) - int(unsigned(y))) [edit] Notes

1-3) 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 = d + std::chrono::days(2);
    assert(d == std::chrono::day(17));
 
    d = d - std::chrono::days(3);
    assert(d == std::chrono::day(14));
 
    constexpr std::chrono::days ds = std::chrono::day(16) - std::chrono::day(14);
    static_assert(ds == std::chrono::days(2));
}
[edit] See also operator++operator++(int)operator--operator--(int) increments or decrements the day
(public member function) [edit] operator+=operator-= adds or subtracts a number of days
(public member function) [edit]

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