Why does Date.yesterday counts as Date.today also?

Question

I have the following model and methods:

class UserPrice < ActiveRecord::Base
  attr_accessible :price,  :purchase_date,    

  def self.today
    where(:p         


        

Answer 1

This is happening because calculations.rb is calling the "current" method of the Date class for the configured timezone (Defaults to UTC).

If you open the rails console you can see the date at which "Date.yesterday" is calculating on by doing:

Time.zone.today

This will probably show you tomorrow's date. So Date.yesterday for what rails sees as today, is today. ;)

You can work with the Date library more directly by doing:

Date.today.advance(:days => -1)

This will give you yesterday's date like you expect whereas active_support is returning:

Date.current.advance(:days => -1)