1 files changed, 5 insertions, 1 deletions
diff --git a/activesupport/lib/active_support/json/backends/jsongem.rb b/activesupport/lib/active_support/json/backends/jsongem.rb
index cfe28d7bb9..533ba25da3 100644
--- a/activesupport/lib/active_support/json/backends/jsongem.rb
+++ b/activesupport/lib/active_support/json/backends/jsongem.rb
@@ -26,7 +26,11 @@ module ActiveSupport
           when nil
             nil
           when DATE_REGEX
-            DateTime.parse(data)
+            begin
+              DateTime.parse(data)
+            rescue ArgumentError
+              data
+            end
           when Array
             data.map! { |d| convert_dates_from(d) }
           when Hash