std::chrono::year_month_day::year_month_day

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std::chrono::year_month_day
 
year_month_day() = default;
 (1) (since C++20)
constexpr year_month_day(const std::chrono::year& y,

                         const std::chrono::month& m,

                         const std::chrono::day& d) noexcept;
 (2) (since C++20)
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

(C++20)
 conventional syntax for Gregorian calendar date creation
(function)
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