Question

System.out.println(
  String.format(
     "You are %s weeks, and %s days pregnant", weeks , days ));

Answer 1

If you are looking for days difference between two date –

public int daysBetween(Date d1, Date d2){
 return (int)( (d2.getTime() - d1.getTime()) / (1000 * 60 * 60 * 24));
 }

week –

public int weeksBetween(Date d1, Date d2){
 return (int)( (d2.getTime() - d1.getTime()) / (1000 * 60 * 60 * 24 * 7));
 }