How to Get Time in Milliseconds in C++?
In programming measuring accurate time is a common requirement for most software development packages. In C++, we have the std::chrono library with various functions for durations, time, and clocks. In this article, we will learn how to get time in milliseconds in C++.
For Example,
Input:
Current system time.
Output:
Current time in milliseconds since epoch: 1716440609637
Get Current Time in Milliseconds
To get the time in milliseconds we can use the methods of <chrono> library. First, get the current time from the system clock by calling the std::chrono::system_clock::now() function and then convert the current time to time since epoch by using the time_since_epoch() function. Finally convert duration to milliseconds by using std::chrono::duration_cast with std::chrono::milliseconds and count() function.
C++ Program to Get Time in Milliseconds
The below program demonstrates how we can get time in milliseconds in C++.
// C++ program to get the current time and convert it into
// milliseconds
#include <chrono>
#include <iostream>
using namespace std;
int main()
{
// Get the current time from the system clock
auto now = chrono::system_clock::now();
// Convert the current time to time since epoch
auto duration = now.time_since_epoch();
// Convert duration to milliseconds
auto milliseconds
= chrono::duration_cast<chrono::milliseconds>(
duration)
.count();
// Print the result
cout << "Current time in milliseconds is: "
<< milliseconds << endl;
return 0;
}
Output
Current time in milliseconds is: 1716441405153
Time Complexity: O(1)
Auxilliary Space: O(1)
Note: The std::chrono::system_clock::now() and std::chrono::duration_cast are defined in C++11 standard. So, these function may not run with older compilers.