From d0793f5d11fce1524ab93c0c349c217e7fc01e44 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Pawe=C5=82=20Dyda?= <pawel.dyda@amu.edu.pl>
Date: Thu, 17 Nov 2022 10:01:18 +0100
Subject: [PATCH] Birthdate based age computation.

---
 .../src/main/java/pl/amu/edu/demo/data/Person.java   | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/demo/03/src/main/java/pl/amu/edu/demo/data/Person.java b/demo/03/src/main/java/pl/amu/edu/demo/data/Person.java
index 36a12de..64580b6 100644
--- a/demo/03/src/main/java/pl/amu/edu/demo/data/Person.java
+++ b/demo/03/src/main/java/pl/amu/edu/demo/data/Person.java
@@ -26,4 +26,16 @@ public class Person {
                 LocalDate.now().minusYears(18).isAfter(birthDate);
     }
 
+    public int getAge() {
+        var birthYear = Objects.requireNonNull(birthDate).getYear();
+        var now = LocalDate.now();
+        var baseDifference = now.getYear() - birthYear;
+        if (birthDate.getMonthValue() > now.getMonthValue() ||
+                (birthDate.getMonthValue() == now.getMonthValue() &&
+                        birthDate.getDayOfMonth() >= now.getDayOfMonth())) {
+            return baseDifference;
+        }
+        return baseDifference - 1;
+    }
+
 }