Gmail SMTP setting in rails3

SMTP setting for rails3and put new gmail.rb then run.

require 'rubygems'
require 'action_mailer'
require 'tlsmail'

  Net::SMTP.enable_tls(OpenSSL::SSL::VERIFY_NONE)
  ActionMailer::Base.delivery_method = :smtp
  ActionMailer::Base.perform_deliveries = true
  ActionMailer::Base.default_charset = "utf-8"
  ActionMailer::Base.raise_delivery_errors = true


ActionMailer::Base.smtp_settings = {
  :enable_starttls_auto => true,
  :address => "smtp.gmail.com",
  :port => 587,
  :domain => "domainname",
  :authentication => :plain,
  :user_name => "notifications@domainname",
  :password => "password"
}


class Emailer < ActionMailer::Base
  def test_email()
    subject    "Test message"
    from       "Test mail"
    recipients 'recipients@domainname.com'
    body        "Test mail for gmail SMTP setting"
  end
end

Emailer.deliver_test_email()

Calculating the Number of Days Between Two Dates in ruby on rails

def room_expiry_date_in_days(room)
a=room.expiry_date.strftime("%Y-%m-%d")
b=room.created_at.strftime("%Y-%m-%d")
a=Date.parse(a)
b=Date.parse(b)
days=(a-b).to_i
return  "#{pluralize(days, 'day',"days")} left"
end