use iconfiguration

DTO/HanyadikHetVanDTO.cs

@@ -7,6 +7,13 @@ namespace hanyadikhetvan.DTO
 {
     public class HanyadikHetVanDTO
     {
-        public int HanyadikHet => (DateTime.Now - (DateTime.Parse(Environment.GetEnvironmentVariable("HANYADIKHET_STARTDATE")))).Days / 7;
+        private readonly DateTime startdate;
+
+        public HanyadikHetVanDTO(string startdate)
+        {
+            this.startdate = DateTime.Parse(startdate);
+        }
+
+        public int HanyadikHet => (DateTime.Now - startdate).Days / 7;
     }
 }