How to get current timestamp in milliseconds since 1970

timestamp.cpp

#include <chrono>

// http://stackoverflow.com/questions/19555121/how-to-get-current-timestamp-in-milliseconds-since-1970-just-the-way-java-gets
// 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:

using namespace std::chrono;

milliseconds ms = duration_cast< milliseconds >(
    system_clock::now().time_since_epoch()
);

printf("\n\ntimestamp: %ld\n\n", ms);