optimize setting a year in posts choices.

fet2020/posts/views.py

@@ -63,8 +63,17 @@ def index(request):
                     fet_meeting_only,
                 )
     else:
+        last_post_year = Post.objects.get_queryset().first().date.year
+        now_year = timezone.now().year
+
+        # if the last post is a year old or more, then set year to it
+        if last_post_year < now_year:
+            year = last_post_year
+        else:
+            year = now_year
+
         data = {
-            'year': timezone.now().year,
+            'year': year,
         }
 
         form = PostSearchForm(data)