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Showing content from https://timsong-cpp.github.io/cppwp/n4659/time.clock below:

23 General utilities library [utilities]

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.

Objects of class steady_­clock represent clocks for which values of time_­point never decrease as physical time advances and for which values of time_­point advance at a steady rate relative to real time. That is, the clock may not be adjusted.

class steady_clock {
public:
  using rep        = unspecified;
  using period     = ratio<unspecified, unspecified>;
  using duration   = chrono::duration<rep, period>;
  using time_point = chrono::time_point<unspecified, duration>;
  static constexpr bool is_steady = true;

  static time_point now() noexcept;
};

Objects of class high_­resolution_­clock represent clocks with the shortest tick period. high_­resolution_­clock may be a synonym for system_­clock or steady_­clock.

class high_resolution_clock {
public:
  using rep        = unspecified;
  using period     = ratio<unspecified, unspecified>;
  using duration   = chrono::duration<rep, period>;
  using time_point = chrono::time_point<unspecified, duration>;
  static constexpr bool is_steady = unspecified;

  static time_point now() noexcept;
};

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