import java.time.*;
import java.time.temporal.*;
import java.util.*;
import java.util.concurrent.TimeUnit;
import java.nio.file.attribute.FileTime;

public class TestFileTimeBM {

    public static void main(String[] args) throws Throwable {
        
        testSecs(10000);
        long t = 0;
        for (int i = 0; i < 10; i++) {
             t += testSecs(10000);
        }
        System.out.println("Seconds:" + (t / 10));

        testMillis(10000);
        t = 0;
        for (int i = 0; i < 10; i++) {
           t += testMillis(10000);
        }
        System.out.println(" Millis:" + (t / 10));

        testNanos(10000);
        t = 0;
        for (int i = 0; i < 10; i++) {
           t += testNanos(10000);
        }
        System.out.println("  Nanos:" + (t / 10));
    }

    private static final int NANOS_PER_SECOND = 1000_000_000;

    private static long testNanos(int N) {
        Random r = new Random();
        long t0 = System.currentTimeMillis();
        for (int i = 0; i < N; i++) {
            long years  = r.nextInt(200);
            long days  = (years * 365L + r.nextInt(365)) * (r.nextBoolean()? 1 : -1);
            long secs = days * 86400L + r.nextInt(86400);
            long  nanos = secs * NANOS_PER_SECOND + r.nextInt(NANOS_PER_SECOND);
            FileTime.from(nanos, TimeUnit.NANOSECONDS).toString();
         }
         return System.currentTimeMillis() - t0;
    }


    private static long testMillis(int N) {
        Random r = new Random();
        long t0 = System.currentTimeMillis();
        for (int i = 0; i < N; i++) {
            long years  = r.nextInt(200);
            long days  = (years * 365L + r.nextInt(365)) * (r.nextBoolean()? 1 : -1);
            long secs = days * 86400L + r.nextInt(86400);
            long millis = secs * 1000 + r.nextInt(1000);
            FileTime.from(millis, TimeUnit.MILLISECONDS).toString();
         }
         return System.currentTimeMillis() - t0;
    }

    private static long testSecs(int N) {
        Random r = new Random();
        long t0 = System.currentTimeMillis();
        for (int i = 0; i < N; i++) {
            long years  = r.nextInt(200);
            long days  = (years * 365L + r.nextInt(365)) * (r.nextBoolean()? 1 : -1);
            long secs = days * 86400L + r.nextInt(86400);
            FileTime.from(secs, TimeUnit.SECONDS).toString();
         }
         return System.currentTimeMillis() - t0;
    }

}