<code java>
import java.time.LocalDate;
import java.time.temporal.ChronoUnit;

/**
 *
 * @author bogusz.thierry
 */
public class JavaApplication12 {

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        // TODO code application logic here
       
        
        LocalDate h1 = LocalDate.parse("2022-01-02");
        LocalDate h2 = LocalDate.parse("2022-01-20");
 
        long m1;
        m1 = h1.until(h2,ChronoUnit.DAYS);//18 jours
        
        LocalDate dateJour = LocalDate.now(); //date du jour
        long m2 = h1.until(dateJour, ChronoUnit.DAYS);
 
        System.out.println(m1 + ":" + m2); 
        
    }
    
}
</code>