# std::chrono::weekday

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< cpp‎ | chrono

Defined in header `<chrono>` |  |
class weekday; |  | (since C++20)
inline constexpr std::chrono::weekday Sunday{0}; |  | (since C++20)
inline constexpr std::chrono::weekday Monday{1}; |  | (since C++20)
inline constexpr std::chrono::weekday Tuesday{2}; |  | (since C++20)
inline constexpr std::chrono::weekday Wednesday{3}; |  | (since C++20)
inline constexpr std::chrono::weekday Thursday{4}; |  | (since C++20)
inline constexpr std::chrono::weekday Friday{5}; |  | (since C++20)
inline constexpr std::chrono::weekday Saturday{6}; |  | (since C++20)

The class `weekday` represent a day of the week in the Gregorian calendar. Its normal range is `[`​0​`,` 6`]`, for Sunday through Saturday, but it can hold any value in the range `[`​0​`,` 255`]`. Seven named constants are predefined in the `std::chrono` namespace for the seven days of the week.

`weekday` is a TriviallyCopyable StandardLayoutType.

### Member functions

(constructor) | constructs a `weekday` (public member function)
operator++operator++(int)operator--operator--(int) | increments or decrements the weekday (public member function)
operator+=operator-= | adds or subtracts a number of days (public member function)
c_encoding iso_encoding | retrieves the stored weekday value retrieves ISO 8601 weekday value (public member function)
ok | checks if the stored weekday value is valid (public member function)
operator[] | convenience syntax for constructing a `weekday_indexed` or `weekday_last` from this `weekday` (public member function)

### Nonmember functions

operator== (C++20) | compares two `weekday` values (function)
operator+operator- (C++20) | performs arithmetic on `weekday`s (function)
operator<< (C++20) | outputs a `weekday` into a stream (function template)
from_stream (C++20) | parses a `weekday` from a stream according to the provided format (function template)

### Helper classes

std::formatter<std::chrono::weekday> (C++20) | formatting support for `weekday` (class template specialization)

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