module ActiveRecord::Timestamp

def self.included(base) #:nodoc:

:nodoc: 
def self.included(base) #:nodoc:
  base.alias_method_chain :create, :timestamps
  base.alias_method_chain :update, :timestamps
  base.class_inheritable_accessor :record_timestamps, :instance_writer => false
  base.record_timestamps = true
end

def create_with_timestamps #:nodoc:

:nodoc: 
def create_with_timestamps #:nodoc:
  if record_timestamps
    current_time = current_time_from_proper_timezone
    write_attribute('created_at', current_time) if respond_to?(:created_at) && created_at.nil?
    write_attribute('created_on', current_time) if respond_to?(:created_on) && created_on.nil?
    write_attribute('updated_at', current_time) if respond_to?(:updated_at) && updated_at.nil?
    write_attribute('updated_on', current_time) if respond_to?(:updated_on) && updated_on.nil?
  end
  create_without_timestamps
end

def current_time_from_proper_timezone 

def current_time_from_proper_timezone
  self.class.default_timezone == :utc ? Time.now.utc : Time.now
end

def touch(attribute = nil)

product.touch(:designed_at) # updates the designed_at attribute
product.touch # updates updated_at

Examples:

If an attribute name is passed, that attribute is used for the touch instead of the updated_at/on attributes.
If the save fails because of validation errors, an ActiveRecord::RecordInvalid exception is raised.
Saves the record with the updated_at/on attributes set to the current time. 
def touch(attribute = nil)
  current_time = current_time_from_proper_timezone
  if attribute
    write_attribute(attribute, current_time)
  else
    write_attribute('updated_at', current_time) if respond_to?(:updated_at)
    write_attribute('updated_on', current_time) if respond_to?(:updated_on)
  end
  save!
end

def update_with_timestamps(*args) #:nodoc:

:nodoc: 
def update_with_timestamps(*args) #:nodoc:
  if record_timestamps && (!partial_updates? || changed?)
    current_time = current_time_from_proper_timezone
    write_attribute('updated_at', current_time) if respond_to?(:updated_at)
    write_attribute('updated_on', current_time) if respond_to?(:updated_on)
  end
  update_without_timestamps(*args)
end