higher precision currentTime in java

TimeTest.java

import static org.junit.Assert.*;

import org.junit.Test;

public class TimeTest {
  private final static long nanoTimeOffset = (System.currentTimeMillis() * 1000000) - System.nanoTime();
  
  public static long currentTimeNanos() {
    return System.nanoTime() + nanoTimeOffset;
  }
  
  public static long currentTimeMicros() {
    return currentTimeNanos() / 1000;
  }
  
  public static void assertMaxDiff(long expected, long actual, long diff) {
    assertTrue("difference between " + expected + " and " + actual + " greater than " + diff, 
        Math.abs(expected - actual) <= diff);
  }
  
  @Test
  public void testCurrentTimeNanos() {
    assertMaxDiff(System.currentTimeMillis(), currentTimeNanos() / 1000000, 1);
  }
  
  @Test
  public void testCurrentTimeMicros() {
    assertMaxDiff(System.currentTimeMillis(), currentTimeMicros() / 1000, 1);
  }

}