diff --git a/lib/jekyll/filters.rb b/lib/jekyll/filters.rb
index fca03437..5972aad6 100644
--- a/lib/jekyll/filters.rb
+++ b/lib/jekyll/filters.rb
@@ -302,6 +302,8 @@ module Jekyll
       case input
       when Time
         input
+      when Date
+        input.to_time
       when String
         Time.parse(input) rescue Time.at(input.to_i)
       when Numeric