#include 

// Get the time since epoch (realtime clock), in milliseconds
int64_t getCurrentMSinceEpoch()
{
    return std::chrono::duration_cast(std::chrono::system_clock::now().time_since_epoch()).count();
}

// Get the time since started, in milliseconds
// Better for time difference because it's faster than system_clock
int64_t getTimeMS()
{
    return std::chrono::duration_cast(std::chrono::steady_clock::now().time_since_epoch()).count();
}