std::chrono::year_month_day::year_month_day (3) Linux Manual Page
std::chrono::year_month_day::year_month_day – std::chrono::year_month_day::year_month_day
Synopsis
year_month_day() = default;
(1)(since C++ 20)
constexpr year_month_day(const std::chrono::year &y,
const std::chrono::month &m, (2)(since C++ 20)
const std::chrono::day &d) noexcept;
constexpr year_month_day(const std::chrono::year_month_day_last &ymdl) noexcept;
(since C++ 20)
constexpr year_month_day(const std::chrono::sys_days &dp) noexcept;
(since C++ 20)
explicit constexpr year_month_day(const std::chrono::local_days &dp) noexcept;
(since C++ 20)Constructs a year_month_day object.
1) Default constructor leaves the date uninitialized.
2) Constructs a year_month_day object that stores the year y, month m and day d.
3) Constructs a year_month_day object that stores the year ymdl.year(), month ymdl.month() and day ymdl.day().
4) Constructs a year_month_day object that represent the same date as the one represented by dp.
5) Constructs a year_month_day object that represent the same date as the one represented by dp, as if by year_month_day(sys_days(dp.time_since_epoch())).
Constructors (3-4) define implicit conversions from std::chrono::year_month_day_last and std::chrono::sys_days, respectively.
For any year_month_day object ymd representing a valid date (ymd.ok() == true), converting ymd to sys_days and back yields the same value.
Notes
A year_month_day can also be created by combining one of the partial-date types std::chrono::year_month and std::chrono::month_day with the missing component (day and year, respectively) using operator/.
See also
operator/ conventional syntax for Gregorian calendar date creation
(C++20)