Rails - Feb 2006 - How can i specify default time to datetime_select tag

I want to specify a different default time to datetime_select tag how 
can i do that.


also i was looking at rails helper code

-----------------------------------------------------------------------
module ActionView
  module Helpers
    module DateHelper

def to_datetime_select_tag(options = {})
        defaults = { :discard_type => true }
        options  = defaults.merge(options)
        options_with_prefix = Proc.new { |position| 
options.merge(:prefix => 
"#{@object_name}[#{@method_name}(#{position}i)]") }
        datetime = options[:include_blank] ? (value || nil) : (value || 
Time.now)

        datetime_select  = select_year(datetime, 
options_with_prefix.call(1))
        datetime_select << select_month(datetime, 
options_with_prefix.call(2)) unless options[:discard_month]
        datetime_select << select_day(datetime, 
options_with_prefix.call(3)) unless options[:discard_day] || 
options[:discard_month]
        datetime_select << '' &mdash; '' +
select_hour(datetime,
options_with_prefix.call(4)) unless options[:discard_hour]
        datetime_select << '' : '' +
select_minute(datetime,
options_with_prefix.call(5)) unless options[:discard_minute] || 
options[:discard_hour]

        datetime_select
      end
-----------------------------------------------------------------------

i was wondering where did the variable value come from in follong line:

 datetime = options[:include_blank] ? (value || nil) : (value || 
Time.now)


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