StopWatch -TizzyT

// Stopwatch which utilizes high-resolution performance counters for more precision
public class StopWatch {
    private long start, stop;
    private boolean running;

    // The duration in days the stopwatch has elapsed
    public double elapsedDays() {
        if (running) return (System.nanoTime() - start) / 86400000000000.0;
        return (stop - start) / 86400000000000.0;
    }

    // The duration in hours the stopwatch has elapsed
    public double elapsedHours() {
        if (running) return (System.nanoTime() - start) / 3600000000000.0;
        return (stop - start) / 3600000000000.0;
    }

    // The duration in minutes the stopwatch has elapsed
    public double elapsedMinutes() {
        if (running) return (System.nanoTime() - start) / 60000000000.0;
        return (stop - start) / 60000000000.0;
    }

    // The duration in seconds the stopwatch has elapsed
    public double elapsedSeconds() {
        if (running) return (System.nanoTime() - start) / 1000000000.0;
        return (stop - start) / 1000000000.0;
    }

    // The duration in milliseconds the stopwatch has elapsed
    public double elapsedMilliseconds() {
        if (running) return (System.nanoTime() - start) / 1000000.0;
        return (stop - start) / 1000000.0;
    }

    // The duration in microseconds the stopwatch has elapsed
    public double elapsedMicroseconds() {
        if (running) return (System.nanoTime() - start) / 1000.0;
        return (stop - start) / 1000.0;
    }

    // The duration in nanoseconds the stopwatch has elapsed
    public double elapsedNanoseconds() {
        if (running) return (System.nanoTime() - start);
        return stop - start;
    }

    // Starts the StopWatch and keeps time
    public void Start() {
        if (!running) {
            start = System.nanoTime() - (stop - start);
            running = true;
        }
    }

    // Stops the StopWatch from keeping time
    public void Stop() {
        if (running) {
            stop = System.nanoTime();
            running = false;
        }
    }

    // Resets the time at which the StopWatch started keeping time
    public void Reset() {
        start = System.nanoTime();
    }

    // Resets the time at which the StopWatch started keeping time and also starts keeping time
    public void Restart() {
        start = System.nanoTime();
        running = true;
    }
}