[time.cal.ymd.overview] (original) (raw)

30 Time library [time]

30.8 The civil calendar [time.cal]

30.8.14 Class year_month_day [time.cal.ymd]

30.8.14.1 Overview [time.cal.ymd.overview]

namespace std::chrono { class year_month_day { chrono::year y_; chrono::month m_; chrono::day d_; public: year_month_day() = default;constexpr year_month_day(const chrono::year& y, const chrono::month& m,const chrono::day& d) noexcept;constexpr year_month_day(const year_month_day_last& ymdl) noexcept;constexpr year_month_day(const sys_days& dp) noexcept;constexpr explicit year_month_day(const local_days& dp) noexcept;constexpr year_month_day& operator+=(const months& m) noexcept;constexpr year_month_day& operator-=(const months& m) noexcept;constexpr year_month_day& operator+=(const years& y) noexcept;constexpr year_month_day& operator-=(const years& y) noexcept;constexpr chrono::year year() const noexcept;constexpr chrono::month month() const noexcept;constexpr chrono::day day() const noexcept;constexpr operator sys_days() const noexcept;constexpr explicit operator local_days() const noexcept;constexpr bool ok() const noexcept;};}

year_month_day represents a specific year, month, and day.

year_month_day is a field-based time point with a resolution of days.

[Note 1:

year_month_day supports years- and months-oriented arithmetic, but not days-oriented arithmetic.

For the latter, there is a conversion to sys_days, which efficiently supports days-oriented arithmetic.

— _end note_]

year_month_day is a trivially copyable and standard-layout class type.