std::chrono::year_month::ok

From cppreference.com
< cpplrm; | chronolrm; | year month
Date and time utilities
(C++11)
(C++11)
Clocks
(C++20)
(C++20)
(C++20)
(C++20)
(C++20)
Calendars
(C++20)
(C++20)
(C++20)
(C++20)
(C++20)
Time zones
(C++20)
(C++20)
(C++20)
(C++20)
(C++20)
(C++20)
C-style date and time
constexpr bool ok() const noexcept;
(since C++20)

Checks if the year and month values stored in this object are valid.

Return value

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