Just something silly that I threw together.

happybirthdaysean.rb

# @author Mark Seymour (mark.seymour.ns@gmail.com)

require 'date'

class Person
  attr_accessor :first_name
  attr_accessor :last_name
  attr_accessor :birthday
  
  # @param [String] The person's first name
  # @param [String] The person's last name
  # @param [Date] The person's birthday
  # @raise [TypeError] Raises TypeError if birthday is not a Date object.
  def initialize first_name, last_name, birthday
    @first_name = first_name.to_s.capitalize
    @last_name = last_name.to_s.capitalize
    # Only set birthday if it is a Date object. Otherwise, raise a TypeError
    @birthday = (birthday.is_a?(Date) ? birthday : raise(TypeError, "Expected 'Date'"))
  end
  
  # Determines whether the person's birthday is today or not.
  # @todo Make it compatible with leap years
  # @return [Boolean] True if the person's birthday is today, otherwise false.
  def birthday?
    today = Date.today
    @birthday.mon == today.mon && @birthday.day == today.day ? true : false
  end

  # Combines the first_name and last_name attributes into one.
  # @param [Boolean] (false) Formats the name using the "Lastname, Firstname" convention.
  # @return [String] The person's name
  def fullname reversed = false
    reversed ? "#{@last_name}, #{@first_name}" : "#{@first_name} #{@last_name}"
  end
end

# Note that I am using -1 for the year since I do not know Sean's birth year. ;)
seanmorrow = Person.new("Sean", "Morrow", Date.new(-1,03,17)) 
if seanmorrow.birthday? 
  puts "Happy Birthday, #{seanmorrow.fullname}!"
else
  puts "It's not #{seanmorrow.fullname}'s birthday... yet."
end