cpp/chrono/year month day/year month day

Constructs a object. @1@ Default constructor leaves the date uninitialized. @2@ Constructs a object that stores the year, month  and day. @3@ Constructs a object that stores the year, month  and day. @4@ Constructs a object that represent the same date as the one represented by. @5@ Constructs a object that represent the same date as the one represented by, as if by.

Constructors define implicit conversions from std and std, respectively.

For any object  representing a valid date, converting  to std and back yields the same value.