Determines whether thismonth_day stores a valid month-day combination.

The combination is valid ifmonth() represents a valid month (month().ok()==true),unsigned{day()}>=1, andunsigned{day()}<= D, where D is the number of days in the month represented bymonth(). The number of days in February is considered to be 29.

[edit]Return value

true if the month and day combination is valid, otherwise false.

[edit]Example

#include <chrono>#include <iostream> int main(){std::cout<<std::boolalpha; constexprauto md1{std::chrono::July/15};std::cout<<(md1.ok())<<' ';constexprstd::chrono::month_day md2{std::chrono::month(14),std::chrono::day(42)};std::cout<<(md2.ok())<<' ';constexprauto md3{std::chrono::February/29};std::cout<<(md3.ok())<<'\n';}

true false true

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