====== LocalTime ======
  * https://docs.oracle.com/javase/8/docs/api/java/time/LocalTime.html
  * https://docs.oracle.com/javase/tutorial/i18n/format/dateFormat.html
  * https://blog.danlew.net/2013/06/27/how_to_correctly_format_date_time_strings_on_android/
  * https://gist.github.com/MizzleDK/65dafdc6f2e2857aad22
===== until =====
<code java>
import java.time.LocalTime;
import java.time.temporal.ChronoUnit;


/**
 *
 * @author bogusz.thierry
 */
public class JavaApplication1 {

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        // TODO code application logic here
        LocalTime h1 = LocalTime.parse("10:45");
        LocalTime h2 = LocalTime.parse("12:50");
        
        long m1 = h1.until(h2,ChronoUnit.MINUTES);
        long m2 = ChronoUnit.MINUTES.between(h1,h2);
        
        System.out.println(m1 + ":" + m2); // même résultat !
        
    }
    
}
</code>

  * https://docs.oracle.com/javase/8/docs/api/java/time/temporal/ChronoUnit.html
  * https://docs.oracle.com/javase/8/docs/api/java/time/LocalTime.html
  * http://www.java2s.com/Tutorials/Java/java.time/LocalTime/index.htm

Mais aussi : https://docs.oracle.com/javase/8/docs/api/java/time/Duration.html