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.
constructs a weekday (public member function) 

increments or decrements the weekday (public member function) 

adds or subtracts a number of days (public member function) 

retrieves the stored weekday value (public member function) 

checks if the stored weekday value is valid (public member function) 

convenience syntax for constructing a weekday_indexed or weekday_last from this weekday (public member function) 
compares two weekday objects (function) 

performs arithmetic on weekday s (function) 

outputs a weekday into a stream (function template) 

outputs a weekday into a stream according to the provided format (function template) 

parses a weekday from a stream according to the provided format (function template) 
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