How Can I Efficiently Get the Current Date and Time in C ?

How to Efficiently Retrieve Time and Date in C

Objective: Determine a cross-platform method for obtaining current time and date in C .

Solution:

With the advent of C 11, developers gained access to the powerful std::chrono::system_clock::now() function. This function provides a precise timestamp representing the current system time.

Detailed Example:

The following snippet demonstrates the usage of std::chrono::system_clock::now():

#include <iostream>
#include <chrono>
#include <ctime>

int main() {
  auto start = std::chrono::system_clock::now();
  // Sample heavy computation
  auto end = std::chrono::system_clock::now();

  // Calculate computation duration
  std::chrono::duration<double> elapsed_seconds = end - start;
  // Convert to time_t for ctime formatting
  std::time_t end_time = std::chrono::system_clock::to_time_t(end);

  std::cout << "Computation completed at " << std::ctime(&end_time)
            << "Elapsed time: " << elapsed_seconds.count() << "s"
            << std::endl;
}

Output:

Computation completed at Mon Oct 2 00:59:08 2017
Elapsed time: 1.88232s

This example showcases the accurate measurement of computation time and the extraction of the system time, including date and time components.

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