Ruby on Rails 'Date' object enhancements

date_enhancements.rb

class Date

  def beginning_of_halfyear
    beginning_of_month.change(:month => [7, 1].detect { |m| m <= self.month })
  end

  def end_of_halfyear
    beginning_of_month.change(:month => [6, 12].detect { |m| m >= self.month }).end_of_month
  end

  # def beginning_of_month?
  # def beginning_of_week?
  # def beginning_of_quarter?
  # def beginning_of_halfyear?
  # def beginning_of_year?
  # def end_of_month?
  # def end_of_week?
  # def end_of_quarter?
  # def end_of_halfyear?
  # def end_of_year?
  %w(week month quarter halfyear year).each do |period|
    define_method "beginning_of_#{period}?" do
      self == self.send("beginning_of_#{period}")
    end
    define_method "end_of_#{period}?" do
      self == self.send("end_of_#{period}")
    end
  end

end

date_enhancements_spec.rb

require 'spec_helper'

describe Date do

  describe "#beginning_of_week?" do
    it "returns true if today is first day of a week" do
      Timecop.freeze Time.parse("Mon, 29 Oct 2001")
      Date.today.beginning_of_week?.should be_true
    end

    it "returns false if today is not first day of a week" do
      Timecop.freeze Time.parse("Tue, 30 Oct 2001")
      Date.today.beginning_of_week?.should_not be_true
    end
  end

  describe "#beginning_of_month?" do
    it "returns true if today is first day of a month" do
      Timecop.freeze Time.parse("Thu, 1 Nov 2001")
      Date.today.beginning_of_month?.should be_true
    end

    it "returns false if today is not first day of a month" do
      Timecop.freeze Time.parse("Thu, 13 Nov 2001")
      Date.today.beginning_of_month?.should_not be_true
    end
  end

  describe "#beginning_of_quarter?" do
    it "returns true if today is first day of a quarter" do
      Timecop.freeze Time.parse("Thu, 1 Oct 2001")
      Date.today.beginning_of_quarter?.should be_true
    end

    it "returns false if today is not first day of a quarter" do
      Timecop.freeze Time.parse("Thu, 13 Nov 2001")
      Date.today.beginning_of_quarter?.should_not be_true
    end
  end

  describe "#beginning_of_halfyear?" do
    it "returns true if today is first day of a halfyear" do
      Timecop.freeze Time.parse("Sun, 01 Jul 2001")
      Date.today.beginning_of_halfyear?.should be_true
    end

    it "returns false if today is not first day of a halfyear" do
      Timecop.freeze Time.parse("Thu, 13 Nov 2001")
      Date.today.beginning_of_halfyear?.should_not be_true
    end
  end

  describe "#beginning_of_year?" do
    it "returns true if today is first day of a year" do
      Timecop.freeze Time.parse("Thu, 1 Jan 2001")
      Date.today.beginning_of_year?.should be_true
    end

    it "returns false if today is not first day of a year" do
      Timecop.freeze Time.parse("Thu, 13 Nov 2001")
      Date.today.beginning_of_year?.should_not be_true
    end
  end

  describe "#end_of_week?" do
    it "returns true if today is last day of a week" do
      Timecop.freeze Time.parse("Sun, 04 Nov 2001")
      Date.today.end_of_week?.should be_true
    end

    it "returns false if today is not last day of a week" do
      Timecop.freeze Time.parse("Tue, 30 Oct 2001")
      Date.today.end_of_week?.should_not be_true
    end
  end

  describe "#end_of_month?" do
    it "returns true if today is last day of a month" do
      Timecop.freeze Time.parse("Thu, 30 Nov 2001")
      Date.today.end_of_month?.should be_true
    end

    it "returns false if today is not last day of a month" do
      Timecop.freeze Time.parse("Thu, 13 Nov 2001")
      Date.today.end_of_month?.should_not be_true
    end
  end

  describe "#end_of_quarter?" do
    it "returns true if today is last day of a quarter" do
      Timecop.freeze Time.parse("Thu, 31 Dec 2001")
      Date.today.end_of_quarter?.should be_true
    end

    it "returns false if today is not last day of a quarter" do
      Timecop.freeze Time.parse("Thu, 13 Nov 2001")
      Date.today.end_of_quarter?.should_not be_true
    end
  end

  describe "#end_of_halfyear?" do
    it "returns true if today is last day of a halfyear" do
      Timecop.freeze Time.parse("Sun, 30 Jun 2001")
      Date.today.end_of_halfyear?.should be_true
    end

    it "returns false if today is not last day of a halfyear" do
      Timecop.freeze Time.parse("Thu, 13 Nov 2001")
      Date.today.end_of_halfyear?.should_not be_true
    end
  end

  describe "#end_of_year?" do
    it "returns true if today is first day of a year" do
      Timecop.freeze Time.parse("Thu, 31 Dec 2001")
      Date.today.end_of_year?.should be_true
    end

    it "returns false if today is not first day of a year" do
      Timecop.freeze Time.parse("Thu, 13 Nov 2001")
      Date.today.end_of_year?.should_not be_true
    end
  end

end