std::chrono::time_point

 

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std::chrono::time_point

Member functions

time_point::time_point

time_point::time_since_epoch

time_point::operator+time_point::operator-

time_point::operator++time_point::operator-- (C++20)(C++20)

time_point::min

time_point::max

Non-member functions

operator+operator-

operator==operator!=operator<operator<=operator>operator>=operator<=> (until C++20)(C++20)

time_point_cast

floor (C++17)

ceil (C++17)

round (C++17)

Helper classes

common_type

 

Defined in header <chrono>
template<     class Clock,     class Duration = typename Clock::duration > class time_point;		(since C++11)

Class template std::chrono::time_point represents a point in time. It is implemented as if it stores a value of type Duration indicating the time interval from the start of the Clock's epoch.

Clock must meet the requirements for Clock or be std::chrono::local_t (since C++20).

Member types

Member type	Definition
clock	Clock, the clock on which this time point is measured
duration	Duration, a std::chrono::duration type used to measure the time since epoch
rep	Rep, an arithmetic type representing the number of ticks of the duration
period	Period, a std::ratio type representing the tick period of the duration

Member functions

(constructor)	constructs a new time point (public member function)
time_since_epoch	returns the time point as duration since the start of its clock (public member function)
operator+=operator-=	modifies the time point by the given duration (public member function)
operator++operator++(int)operator--operator--(int) (C++20)	increments or decrements the duration (public member function)
min [static]	returns the time point corresponding to the smallest duration (public static member function)
max [static]	returns the time point corresponding to the largest duration (public static member function)

Non-member functions

operator+operator-	performs add and subtract operations involving a time point (function template)
operator==operator!=operator<operator<=operator>operator>=operator<=> (removed in C++20)(C++20)	compares two time points (function template)
time_point_cast	converts a time point to another time point on the same clock, with a different duration (function template)
floor(std::chrono::time_point) (C++17)	converts a time_point to another, rounding down (function template)
ceil(std::chrono::time_point) (C++17)	converts a time_point to another, rounding up (function template)
round(std::chrono::time_point) (C++17)	converts a time_point to another, rounding to nearest, ties to even (function template)

Helper classes

std::common_type<std::chrono::time_point>

specializes the std::common_type trait (class template specialization)

Example

Run this code

#include <algorithm>
#include <iostream>
#include <iomanip>
#include <ctime>
#include <chrono>
 
void slow_motion()
{
    static int a[] {1,2,3,4,5,6,7,8,9,10,11,12};
    while (std::next_permutation(std::begin(a), std::end(a))) { }
}
 
int main()
{
    using namespace std::literals; // enables the usage of 24h instead of std::chrono::hours(24)
    auto now = std::chrono::system_clock::now();
    auto t_c = std::chrono::system_clock::to_time_t(now - 24h);
    std::cout << "24 hours ago, the time was "
              << std::put_time(std::localtime(&t_c), "%F %T") << '\n';
 
    auto start = std::chrono::steady_clock::now();
    slow_motion();
    auto end = std::chrono::steady_clock::now();
    std::cout
      << "Slow calculations took "
      << std::chrono::duration_cast<std::chrono::microseconds>(end - start).count() << "µs ≈ "
      << std::chrono::duration_cast<std::chrono::milliseconds>(end - start).count() << "ms ≈ "
      << std::chrono::duration_cast<std::chrono::seconds>(end - start).count() << "s.\n";
}

Possible output:

24 hours ago, the time was 2020-09-26 17:57:24
Slow calculations took 2542785µs ≈ 2542ms ≈ 2s.

See also

duration (C++11)

a time interval (class template)