Defined in header <chrono>
constexpr std::chrono::day operator ""d(unsigned long long d) noexcept;
(1) (since C++20)

Forms a std::chrono::day literal representing a day of the month in the calendar.


d - the day value

Return value

A std::chrono::day storing d. If d > 255, the stored value is unspecified.

Possible implementation

constexpr std::chrono::day operator ""d(unsigned long long d) noexcept
    return std::chrono::day(d);


This operator is declared in the namespace std::literals::chrono_literals, where both literals and chrono_literals are inline namespaces. Access to this operator can be gained with using namespace std::literals, using namespace std::chrono_literals, and using namespace std::literals::chrono_literals.

In addition, within the namespace std::chrono, the directive using namespace literals::chrono_literals; is provided by the standard library, so that if a programmer uses using namespace std::chrono; to gain access to the classes in the chrono library, the corresponding literal operators become visible as well.


See also

constructs a day
(public member function of std::chrono::day)

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