import java.text.SimpleDateFormat;
import java.text.ParseException;
import java.time.Duration;
import java.util.Date;
 
class Ideone {
    public static void main(String[] args) throws java.lang.Exception {
        new Ideone().calTime("01:18:19.92", "01:18:19.57");
    }
 
    public void calTime(String A, String B) {
        String sFormat = "HH:mm:ss.SSS";
        SimpleDateFormat dFormat = new SimpleDateFormat(sFormat);
 
        try {
 
            Date aDate = dFormat.parse(A);
            Date bDate = dFormat.parse(B);
 
			long interval = aDate.getTime() - bDate.getTime();
			System.out.println("interval in ms: " + interval);
			Duration d = Duration.ofMillis(interval);
			System.out.println("duration: " + d);
 
        } catch (ParseException ex) {
            System.out.println("Failed to parse");
        }
    }
}

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