fix datatime error

activerecord/CHANGELOG.md

@@ -1,3 +1,8 @@
+*   Fix an Active Record DateTime field NoMethodError caused by incomplete 
+    datetime. [Bug #24195](https://github.com/rails/rails/issues/24195)
+
+    *Sen Zhang*
+
 *   Allow `slice` to take an array of methods (without need for splatting).
 
     *Cohen Carlisle*

activerecord/lib/active_record/attribute_methods/time_zone_conversion.rb

@@ -39,7 +39,7 @@ module ActiveRecord
           end
 
           def set_time_zone_without_conversion(value)
-            ::Time.zone.local_to_utc(value).in_time_zone if value
+            ::Time.zone.local_to_utc(value).try(:in_time_zone) if value
           end
 
           def map_avoiding_infinite_recursion(value)

activerecord/test/cases/multiparameter_attributes_test.rb

@@ -260,6 +260,13 @@ class MultiParameterAttributeTest < ActiveRecord::TestCase
         topic.attributes = attributes
         assert_equal Time.zone.local(2000, 1, 1, 16, 24, 0), topic.bonus_time
         assert_not topic.bonus_time.utc?
+
+        attributes = {
+          "written_on(1i)" => "2000", "written_on(2i)" => "", "written_on(3i)" => "",
+          "written_on(4i)" => "", "written_on(5i)" => ""
+        }
+        topic.attributes = attributes
+        assert_nil topic.written_on
       end
     ensure
       Topic.reset_column_information