diff --git a/activerecord/CHANGELOG.md b/activerecord/CHANGELOG.md
index 85880e97eae1d9c1558f3f1ecd5a06cfbc2bbfaf..68c43558fddca50844a54dcf00c73a0ed9d75f5f 100644
--- a/activerecord/CHANGELOG.md
+++ b/activerecord/CHANGELOG.md
@@ -1,5 +1,9 @@
 ## Rails 4.0.0 (unreleased) ##
 
+*   Fix time column type casting for invalid time string values to correctly return nil.
+
+    *Adam Meehan*
+
 *   Allow to pass Symbol or Proc into :limit option of #accepts_nested_attributes_for
 
     *Mikhail Dieterle*
diff --git a/activerecord/lib/active_record/connection_adapters/column.rb b/activerecord/lib/active_record/connection_adapters/column.rb
index 1445bb3b2f9388c3172bdca6f5a8f3474489c511..d0237848c7337356062cca364538713f55403311 100644
--- a/activerecord/lib/active_record/connection_adapters/column.rb
+++ b/activerecord/lib/active_record/connection_adapters/column.rb
@@ -178,7 +178,13 @@ def string_to_dummy_time(string)
           return string unless string.is_a?(String)
           return nil if string.blank?
 
-          string_to_time "2000-01-01 #{string}"
+          dummy_time_string = "2000-01-01 #{string}"
+
+          fast_string_to_time(dummy_time_string) || begin
+            time_hash = Date._parse(dummy_time_string)
+            return nil if time_hash[:hour].nil?
+            new_time(*time_hash.values_at(:year, :mon, :mday, :hour, :min, :sec, :sec_fraction))
+          end
         end
 
         # convert something to a boolean
diff --git a/activerecord/test/cases/base_test.rb b/activerecord/test/cases/base_test.rb
index 9fcee99222bdb51ca6b2eabda24950ff1745cb2b..b9d480d9ce899fea1390342d8e2b4b87416f4946 100644
--- a/activerecord/test/cases/base_test.rb
+++ b/activerecord/test/cases/base_test.rb
@@ -970,6 +970,18 @@ def test_attributes_on_dummy_time
     assert_equal Time.local(2000, 1, 1, 5, 42, 0), topic.bonus_time
   end
 
+  def test_attributes_on_dummy_time_with_invalid_time
+    # Oracle, and Sybase do not have a TIME datatype.
+    return true if current_adapter?(:OracleAdapter, :SybaseAdapter)
+
+    attributes = {
+      "bonus_time" => "not a time"
+    }
+    topic = Topic.find(1)
+    topic.attributes = attributes
+    assert_nil topic.bonus_time
+  end
+
   def test_boolean
     b_nil = Boolean.create({ "value" => nil })
     nil_id = b_nil.id