Rails - Jul 2011 - need help for formating timestamp on round trip: db -> browser -> db

I have a date in the sqlite3 database which gives me trouble

sqlite> select * from accounts;
3|myname|2011-07-10 13:47:26.055000|2011-07-10 13:47:26.055000

putting it into html via the hidden_field.tag like this

    <%= f.hidden_field :updated_at %>

here f comes from

    <%= form_for(@account) do |f| %>

that produces working html code as such

    <input id="account_updated_at"
name="account[updated_at]"
type="hidden" value="2011-07-10 13:47:26.055000" />

now I need to add the very some date as query parameter to an url of a
link and following code works most of the time but NOT with that
example from the database:

<%= link_to ''Destroy'', account_path(account) + "?
account[updated_at]=#{account.updated_at.utc.strftime(''%Y-%m-%d %H:%M:
%S.%N'')}", :confirm => ''Are you sure?'',
:method => :delete %>

which produces

<a href="/accounts/3?account[updated_at]=2011-07-10 13:47:26.550"
data-
confirm="Are you sure?" data-method="delete"
rel="nofollow">Destroy</
a>

this query-parameter parses into a different date then the one I have
in the database - so I can not find the model in the database.

background is an optimistic persistence with the help of this
timestamp since I like to keep the model slim and the activerecord
default would add another "version" column to it.

bug ? or how does this hidden_field method does it right ? I was not
able to find the right spot in the code.

thanx in advance. Kristian

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