Calculate days lived since birth date

Just a small piece of code showing how to calculate total days lived since birth date (to current date):

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import java.util.Calendar; import java.util.GregorianCalendar;    public class TotalLifeTimeDays {      public int getLifeTimeDays(int birthYear, int birthMonth, int birthDay) {        Calendar birthDayCal = new GregorianCalendar();      Calendar currentDayCal = Calendar.getInstance();      birthDayCal.set(birthYear, birthMonth, birthDay);      return (int)((currentDayCal.getTime().getTime() - birthDayCal.getTime().getTime())      / (1000 * 60 * 60 * 24));   }      public static void main(String[] args) {   TotalLifeTimeDays totalLifeTimeDays = new TotalLifeTimeDays();   int totalDays = totalLifeTimeDays.getLifeTimeDays(1982, 11, 20);   System.out.println("Total days lived: " + totalDays);  } }