Borjis131

#include <iostream>
#include <chrono>

int main(){
    std::chrono::high_resolution_clock clock;
    while (1){
        uint64_t current_ms = std::chrono::duration_cast<std::chrono::microseconds>(clock.now().time_since_epoch()).count();
        std::cout << "\r" << current_ms << std::flush;
    }
}