std::chrono::year_month_weekday_last::ok

From cppreference.com
 
 
 
Date and time utilities
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Clocks
(C++20)
                                                  
(C++20)
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(C++20)
Calendars
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Time zones
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C-style date and time
 
 
constexpr bool ok() const noexcept;
(since C++20)

Checks if this object represents a valid date. Since a year_month_weekday_last represents the last weekday of a particular month, it is valid as long as the year, month and weekday are valid.

Return value

year().ok() && month().ok() && weekday().ok()