postgresql - rails postgres date_time not working properly -

i getting weird error when trying save record datetime postgres. works, see first example. other times doesn't work.

update "client_comments" set "comment" = $1, "conversation_time" = $2, "updated_at" = $3 "client_comments"."id" = 2  [["comment", "test2"], ["conversation_time", "2015-03-09 23:42:00.000000"], ["updated_at", "2015-03-16 23:50:32.307101"]] 

works, no problems!

when use form

<%= f.datetime_select :conversation_time, { :start_year => 2010, :end_year => date.today.year } %> 

i click update, params are:

parameters: {"utf8"=>"✓", "authenticity_token"=>"iz/ms9mi3k7h0dg05afjaiktudlpug3ipatapgbheqa=", "client_comment"=>{"client_id"=>"1221", "user_id"=>"1", "company_id"=>"mon", "conversation_time(1i)"=>"2015", "conversation_time(2i)"=>"3", "conversation_time(3i)"=>"7", "conversation_time(4i)"=>"19", "conversation_time(5i)"=>"42", "comment"=>"test2"}, "commit"=>"update client comment", "id"=>"2"} 

sql is:

update "client_comments" set "conversation_time" = $1, "updated_at" = $2 "client_comments"."id" = 2  [["conversation_time", "2015-03-08 00:42:00.000000"], ["updated_at", "2015-03-17 00:01:43.611166"]] 

which causes exception:

pg::datatypemismatch: error:  column "conversation_time" of type timestamp without time zone expression of type time without time zone @ character 52 hint:  need rewrite or cast expression. 

another weird thing hour in case 19 trying set hour 00 in sql, dont know either.

here schema:

# \d+ client_comments                                                          table       "public.client_comments"   column       |            type             |                          modifiers                           | storage  | stats target | description    -------------------+-----------------------------+------------------------------     --------------------------------+----------+--------------+-------------  id                | integer                     | not null default  nextval('client_comments_id_seq'::regclass) | plain    |              |   client_id         | integer                     |                                                              | plain    |              |   user_id           | integer                     |                                                              | plain    |              |   company_id        | integer                     |                                                              | plain    |              |   comment           | text                        |                                                              | extended |              |   employee_user_id  | integer                     |                                                              | plain    |              |   created_at        | timestamp without time zone |                                                              | plain    |              |   updated_at        | timestamp without time zone |                                                              | plain    |              |   conversation_time | timestamp without time zone |                                                              | plain    |              |   indexes: "client_comments_pkey" primary key, btree (id) "index_client_comments_on_client_id" btree (client_id) "index_client_comments_on_company_id" btree (company_id) "index_client_comments_on_user_id" btree (user_id) has oids: no 

rails v 4.1.8 psql (9.3.2)

well not perfect answer, turns out bug either rails 4.1 , pg 0.17.1 or them working together. upgraded rails 4.2.1 (just came out) , pg 0.18.1 , well. note pg 0.81.1 , earlier versions of rails had bug blob support, 4.2.1 seems have fixed that.