Objects of class system_clock represent wall clock time from the system-wide realtime clock.
class system_clock {
public:
using rep = see below;
using period = ratio<unspecified, unspecified>;
using duration = chrono::duration<rep, period>;
using time_point = chrono::time_point<system_clock>;
static constexpr bool is_steady = unspecified;
static time_point now() noexcept;
static time_t to_time_t (const time_point& t) noexcept;
static time_point from_time_t(time_t t) noexcept;
};
using system_clock::rep = unspecified;
Requires: system_clock::duration::min() < system_clock::duration::zero() shall be true.
[ Note: This implies that rep is a signed type. — end note ]
static time_t to_time_t(const time_point& t) noexcept;
Returns: A time_t object that represents the same point in time as t when both values are restricted to the coarser of the precisions of time_t and time_point. It is implementation-defined whether values are rounded or truncated to the required precision.
static time_point from_time_t(time_t t) noexcept;
Returns: A time_point object that represents the same point in time as t when both values are restricted to the coarser of the precisions of time_t and time_point. It is implementation-defined whether values are rounded or truncated to the required precision.
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