What is going on here?

My output

$ ruby -v
ruby 1.9.3p327 (2012-11-10 revision 37606) [x86_64-darwin12.2.0]

$ ruby test_time.rb
Parsing the timestamp 2012-12-11 18:01:54.246524000
The float compare to string formatted output: false
"1355277714.2465239"
"1355277714.246524"

test_time.rb

require 'rubygems'
require 'time'
require 'active_support'

timestamp_to_parse = "2012-12-11 18:01:54.246524000"

puts "Parsing the timestamp #{timestamp_to_parse}"

time = Time.parse(timestamp_to_parse)

puts "The float compare to string formatted output: #{time.to_f.to_s == time.strftime("%s.%6N")}"

p time.to_f.to_s
p time.strftime("%s.%6N")