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c++timestamp

How to get current timestamp in milliseconds since 1970 just the way Java gets

In Java, we can use System.currentTimeMillis() to get the current timestamp in Milliseconds since epoch time which is -

the difference, measured in milliseconds, between the current time and midnight, January 1, 1970 UTC.

In C++ how to get the same thing?

Currently I am using this to get the current timestamp - 

struct timeval tp;
gettimeofday(&tp, NULL);
long int ms = tp.tv_sec * 1000 + tp.tv_usec / 1000; //get current timestamp in milliseconds

cout << ms << endl;

This looks right or not?

Solution

  • If you have access to the C++ 11 libraries, check out the std::chrono library. You can use it to get the milliseconds since the Unix Epoch like this:

    #include <chrono>

// ...

using namespace std::chrono;
milliseconds ms = duration_cast< milliseconds >(
    system_clock::now().time_since_epoch()
);