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Showing content from https://en.cppreference.com/w/cpp/language/../error/error_code/../../chrono/time_point.html below:

std::chrono::time_point - cppreference.com

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).

(until C++23) [edit] Member types Type Description the clock on which this time point is measured
(typedef) a std::chrono::duration type used to measure the time since epoch
(typedef) an arithmetic type representing the number of ticks of the duration
(typedef) a std::ratio type representing the tick period of the duration
(typedef) [edit] Member functions [edit] Non-member functions [edit] Helper classes [edit] Example

#include <algorithm>
#include <chrono>
#include <ctime>
#include <iomanip>
#include <iostream>
 
void slow_motion()
{
    static int a[]{1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12};
    // Generate Î(13) == 12! permutations:
    while (std::ranges::next_permutation(a).found) {}
}
 
int main()
{
    using namespace std::literals; // enables literal suffixes, e.g. 24h, 1ms, 1s.
 
    const std::chrono::time_point<std::chrono::system_clock> now =
        std::chrono::system_clock::now();
 
    const std::time_t 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") << std::flush;
 
    const std::chrono::time_point<std::chrono::steady_clock> start =
        std::chrono::steady_clock::now();
 
    std::cout << "Different clocks are not comparable: \n"
                 "  System time: " << now.time_since_epoch() << "\n"
                 "  Steady time: " << start.time_since_epoch() << '\n';
 
    slow_motion();
 
    const auto end = std::chrono::steady_clock::now();
    std::cout
        << "Slow calculations took "
        << std::chrono::duration_cast<std::chrono::microseconds>(end - start) << " â "
        << (end - start) / 1ms << "ms â " // almost equivalent form of the above, but
        << (end - start) / 1s << "s.\n";  // using milliseconds and seconds accordingly
}

Possible output:

24 hours ago, the time was 2021-02-15 18:28:52.
Different clocks are not comparable:
  System time: 1666497022681282572ns
  Steady time: 413668317434475ns
Slow calculations took 2090448Âµs â 2090ms â 2s.

[edit] See also

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