diff --git a/lib/jekyll/post.rb b/lib/jekyll/post.rb
index e5709300..4e391a77 100644
--- a/lib/jekyll/post.rb
+++ b/lib/jekyll/post.rb
@@ -223,8 +223,8 @@ module Jekyll
         :month       => date.strftime("%m"),
         :day         => date.strftime("%d"),
         :title       => slug,
-        :i_day       => date.strftime("%d").to_i.to_s,
-        :i_month     => date.strftime("%m").to_i.to_s,
+        :i_day       => date.strftime("%-d"),
+        :i_month     => date.strftime("%-m"),
         :categories  => (categories || []).map { |c| c.to_s }.join('/'),
         :short_month => date.strftime("%b"),
         :short_year  => date.strftime("%y"),