Merge pull request #499 from kreynolds/to_date_downcase_regression

Fix case sensitivity regression in date standard filter

lib/liquid/standardfilters.rb

@@ -306,6 +306,8 @@ module Liquid
     def to_date(obj)
       return obj if obj.respond_to?(:strftime)
 
+      obj = obj.downcase if obj.is_a?(String)
+
       case obj
       when 'now'.freeze, 'today'.freeze
         Time.now

test/integration/standard_filter_test.rb

@@ -249,6 +249,7 @@ class StandardFiltersTest < Minitest::Test
     assert_equal "07/16/2004", @filters.date("Fri Jul 16 01:00:00 2004", "%m/%d/%Y")
     assert_equal "#{Date.today.year}", @filters.date('now', '%Y')
     assert_equal "#{Date.today.year}", @filters.date('today', '%Y')
+    assert_equal "#{Date.today.year}", @filters.date('Today', '%Y')
 
     assert_equal nil, @filters.date(nil, "%B")