<chrono>

Include the standard header <chrono> to define classes and functions that represent and manipulate time durations and time instants.

#include <chrono>

Classes

Name	Description
duration Class	Describes a type that holds a time interval.
steady_clock Class	Represents a steady clock.
time_point Class	Describes a type that represents a point in time.

Name	Description
common_type Structure	Describes specializations of template class common_type for instantiations of duration and time_point.
duration_values Structure	Provides specific values for the duration template parameter Rep.
system_clock Structure	Represents a clock type that is based on the real-time clock of the system.
treat_as_floating_point Structure	Specifies whether a type can be treated as a floating-point type.

Name	Description
duration_cast Function	Casts a duration object to a specified type.
time_point_cast Function	Casts a time_point object to a specified type.

Name	Description
operator- Operator (STL)	Operator for subtraction or negation of duration and time_point objects.
operator!= Operator (STL)	Inequality operator that is used with duration or time_point objects.
operator% Operator (STL)	Operator for modulo operations on duration objects.
operator* Operator (STL)	Multiplication operator for duration objects.
operator/ Operator (STL)	Division operator for duration objects.
operator+ Operator (STL)	Adds duration and time_point objects.
operator< Operator (STL)	Determines whether one duration or time_point object is less than another duration or time_point object.
operator<= Operator (STL)	Determines whether one duration or time_point object is less than or equal to another duration or time_point object.
operator== Operator (STL)	Determines whether two duration objects represent time intervals that have the same length, or whether two time_point objects represent the same point in time.
operator> Operator (STL)	Determines whether one duration or time_point object is greater than another duration or time_point object.
operator>= Operator (STL)	Determines whether one duration or time_point object is greater than or equal to another duration or time_point object.

For more information about ratio types that are used in the following typedefs, see <ratio>.

Typedef	Description
typedef duration<long long, nano> nanoseconds;	Synonym for a duration type that has a tick period of one nanosecond.
typedef duration<long long, micro> microseconds;	Synonym for a duration type that has a tick period of one microsecond.
typedef duration<long long, milli> milliseconds;	Synonym for a duration type that has a tick period of one millisecond.
typedef duration<long long> seconds;	Synonym for a duration type that has a tick period of one second.
typedef duration<int, ratio<60> > minutes;	Synonym for a duration type that has a tick period of one minute.
typedef duration<int, ratio<3600> > hours;	Synonym for a duration type that has a tick period of one hour.