Java Utililty Methods Age Calculate

return getAge(date, new GregorianCalendar(tz));

Integer ageToReturn = null;
if (dateNaissance != null) {
    Calendar dateOfBirth = Calendar.getInstance();
    dateOfBirth.setTime(dateNaissance);
    Calendar today = Calendar.getInstance();
    int age = today.get(Calendar.YEAR) - dateOfBirth.get(Calendar.YEAR);
    dateOfBirth.add(Calendar.YEAR, age);
    if (today.before(dateOfBirth)) {
...

if (time == null) {
    throw new NullPointerException("time is null");
if (birth == null) {
    throw new NullPointerException("birth is null");
Calendar c1 = Calendar.getInstance();
c1.setTimeInMillis(time.getTime());
...

final Calendar endDate = Calendar.getInstance();
final Calendar startDate = Calendar.getInstance();
startDate.setTime(birthDay);
endDate.setTime(currDate);
int years = endDate.get(Calendar.YEAR) - startDate.get(Calendar.YEAR);
startDate.set(Calendar.YEAR, endDate.get(Calendar.YEAR));
if (startDate.after(endDate)) {
    years--;
...

Calendar c = Calendar.getInstance();
if (year == null) {
    return 20;
year = year.substring(0, 4);
Integer age = c.get(Calendar.YEAR) - Integer.parseInt(year);
return age;

if (null == birthDay)
    return "-";
Calendar cal = Calendar.getInstance();
if (cal.before(birthDay)) {
    throw new IllegalArgumentException("The birthDay is before Now.It's unbelievable!");
int yearNow = cal.get(Calendar.YEAR);
int monthNow = cal.get(Calendar.MONTH);
...

if (birthday == null || date == null || date.compareTo(birthday) < 0) {
    return 0;
final Calendar cal = Calendar.getInstance();
cal.setTime(birthday);
final int birthYear = cal.get(Calendar.YEAR);
final int birthMonth = cal.get(Calendar.MONTH);
final int birthDay = cal.get(Calendar.DAY_OF_MONTH);
...

String result = "";
Calendar now = Calendar.getInstance();
Calendar bd = Calendar.getInstance();
bd.setTime(birth);
long ONE_DAY = 1000 * 60 * 60 * 24;
long date1_ms = now.getTimeInMillis();
long date2_ms = bd.getTimeInMillis();
long difference_ms = Math.abs(date1_ms - date2_ms);
...

if (birthday == null) {
    return null;
Calendar dateOfBirth = Calendar.getInstance();
dateOfBirth.setTime(birthday);
Calendar today = Calendar.getInstance();
int age = today.get(Calendar.YEAR) - dateOfBirth.get(Calendar.YEAR);
dateOfBirth.add(Calendar.YEAR, age);
...

return new Date().getYear() - date.getYear();