In this case, you can create global template to accomplish this matter:

sub {
require GT::Date;
return GT::Date::date_get(time, "%mm%-%dd%-%yyyy% %hh%:%MM%:%ss%");
}

Now, you need to add those hidden objects below into:

- add_form:

<input type="hidden" name="added_date" value="<%global_name%">
<input type="hidden" name="updated_date" value="<%global_name%">

- modify_form:
<input type="hidden" name="updated_date" value="<%global_name%">

Hope that helps,

TheStone.

B.