std::chrono::day::operator+=, std::chrono::day::operator-= - cppreference.com
From cppreference.com
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(1) | (since C++20) |
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(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;.
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
#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)); }