better range text for explore popular

app/presenters/post_set_presenters/popular.rb

@@ -1,7 +1,7 @@
 module PostSetPresenters
   class Popular < Base
     attr_accessor :post_set, :tag_set_presenter
-    delegate :posts, :date, :to => :post_set
+    delegate :posts, :date, :min_date, :max_date, :to => :post_set
     
     def initialize(post_set)
       @post_set = post_set
@@ -30,5 +30,15 @@ module PostSetPresenters
     def next_month
       1.month.since(date)
     end
+    
+    def range_text
+      if min_date == max_date
+        date.strftime("%B %d, %Y")
+      elsif max_date - min_date == 6
+        min_date.strftime("Week of %B %d, %Y")
+      else
+        date.strftime("Month of %B %Y")
+      end
+    end
   end
 end

app/views/explore/posts/popular.html.erb

@@ -1,6 +1,6 @@
 <div id="c-explore-posts">
   <div id="a-index">
-    <h1>Explore: <%= @post_set.min_date %> &ndash; <%= @post_set.max_date %></h1>
+    <h1>Explore: <%= @post_set.presenter.range_text %></h1>
     
     <%= render "date_explore", :post_set => @post_set %>