From fde162738816e1affa03dc07dc43fd6fbfc6193d Mon Sep 17 00:00:00 2001
From: Maximilian Pfundstein <maximilian@pfundstein.org>
Date: Fri, 4 Oct 2024 18:58:53 +0200
Subject: [PATCH] fix: calculate personnummer correctly before annual birthday

---
 Personnummer/Personnummer.cs | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/Personnummer/Personnummer.cs b/Personnummer/Personnummer.cs
index af4689c..31230c3 100644
--- a/Personnummer/Personnummer.cs
+++ b/Personnummer/Personnummer.cs
@@ -24,7 +24,15 @@ public Options()
 
         public DateTime Date { get; private set; }
 
-        public int Age => DateTime.Now.Year - Date.Year;
+        public int Age
+        {
+            get
+            {
+                var now = DateTime.Now;
+                var differenceInTotalMonth = 12 * (now.Year - Date.Year) + now.Month - Date.Month;
+                return differenceInTotalMonth / 12;
+            }
+        }
 
         public string Separator => Age >= 100 ? "+" : "-";