how to calculate age on entry of dob in java

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Ismail
13 Aug 2019
1LocalDate today = LocalDate.now();
2LocalDate birthday = LocalDate.of(1987, 09, 24);
3
4Period period = Period.between(birthday, today);
5
6//Now access the values as below
7System.out.println(period.getDays());
8System.out.println(period.getMonths());
9System.out.println(period.getYears());
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Leonardo
04 Aug 2019
1import java.text.ParseException;
2import java.text.SimpleDateFormat;
3import java.util.Calendar;
4import java.util.Date;
5 
6public class AgeCalculator
7{
8   private static Age calculateAge(Date birthDate)
9   {
10      int years = 0;
11      int months = 0;
12      int days = 0;
13 
14      //create calendar object for birth day
15      Calendar birthDay = Calendar.getInstance();
16      birthDay.setTimeInMillis(birthDate.getTime());
17 
18      //create calendar object for current day
19      long currentTime = System.currentTimeMillis();
20      Calendar now = Calendar.getInstance();
21      now.setTimeInMillis(currentTime);
22 
23      //Get difference between years
24      years = now.get(Calendar.YEAR) - birthDay.get(Calendar.YEAR);
25      int currMonth = now.get(Calendar.MONTH) + 1;
26      int birthMonth = birthDay.get(Calendar.MONTH) + 1;
27 
28      //Get difference between months
29      months = currMonth - birthMonth;
30 
31      //if month difference is in negative then reduce years by one 
32      //and calculate the number of months.
33      if (months < 0)
34      {
35         years--;
36         months = 12 - birthMonth + currMonth;
37         if (now.get(Calendar.DATE) < birthDay.get(Calendar.DATE))
38            months--;
39      } else if (months == 0 && now.get(Calendar.DATE) < birthDay.get(Calendar.DATE))
40      {
41         years--;
42         months = 11;
43      }
44 
45      //Calculate the days
46      if (now.get(Calendar.DATE) > birthDay.get(Calendar.DATE))
47         days = now.get(Calendar.DATE) - birthDay.get(Calendar.DATE);
48      else if (now.get(Calendar.DATE) < birthDay.get(Calendar.DATE))
49      {
50         int today = now.get(Calendar.DAY_OF_MONTH);
51         now.add(Calendar.MONTH, -1);
52         days = now.getActualMaximum(Calendar.DAY_OF_MONTH) - birthDay.get(Calendar.DAY_OF_MONTH) + today;
53      } 
54      else
55      {
56         days = 0;
57         if (months == 12)
58         {
59            years++;
60            months = 0;
61         }
62      }
63      //Create new Age object 
64      return new Age(days, months, years);
65   }
66 
67   public static void main(String[] args) throws ParseException
68   {
69      SimpleDateFormat sdf = new SimpleDateFormat("dd/MM/yyyy");
70      Date birthDate = sdf.parse("29/11/1981");     
71      Age age = calculateAge(birthDate);
72      System.out.println(age);
73   }
74}
75
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