# Calculate the financial year, with the supplied date
  def get_financial_year(opts={})
    date = opts[:date].is_a?(Date)? opts[:date] : Time.now.to_date
...

#MM-YYYY
"2011-10".split("-").reverse.join("/") => "10/2011"

def self.at_beginning_of_interval(time, interval_type)
      #simple substraction does not (seem) to work for long intervals (summer/winter time ?)
      #and at_beginning_of_hour is not defined
...

def first_day_of_month(selected_date)
...

def date(date, time = false)
    date = Date.parse(date) if date.is_a? String
    day = date.strftime('%d')
...

class Article < ActiveRecord::Base

  # Find all articles in the given date range based on the published_at field
...