Hashes with Time instances in it breaks when to_json is called on it.

I tested it with rails edge.

I am not able to produce this problem with script/console.

ruby-1.8.7-p249 > {:date => Time.utc(2008, 5, 17)}.to_json
 => "{\"date\":\"2008-05-17T00:00:00Z\"}" 
ruby-1.8.7-p249 > {:date => Time.utc(2008, 5, 17)}.to_json
 => "{\"date\":\"2008-05-17T00:00:00Z\"}"

I am not able to produce problem with rails runner

$ rails runner 'User.lab'
{"date1":"2008-05-17T00:00:00Z"}

class User < ActiveRecord::Base
  def self.lab
    t = Time.utc(2008, 5, 17)
    real = {:date1 => t}.to_json
    puts real
  end
end

However the attached test code is indeed failing which is really weird. Without digging dip into it I have a feeling that in test somewhere something is getting changed which is messing up to_json.

@Neeraj Singh: Perhaps you have the json gem vendored elsewhere, or directly in the Gemfile, causing Rails to use that one instead of the bundled one? I'm also on edge rails, btw: gem 'rails', :git => 'git://github.com/rails/rails.git'.

This is what I have in my Gemfile.

$ cat Gemfile 

source 'http://rubygems.org'
#gem 'rails', '3.0.0.beta3'
gem 'rails', :git => 'git://github.com/rails/rails.git'
gem 'sqlite3-ruby', :require => 'sqlite3'

in console

ruby-1.8.7-p249 > {:date => Time.utc(2008, 5, 17)}.to_json
 => "{\"date\":\"2008-05-17T00:00:00Z\"}"

Really weird that I'm not able to reproduce it.