You know those people who can tell you the weekday for any date? Here's how to practise that. Tip: 0 means Sunday through to 6 means Saturday when talking about "weekday codes". Grey Matters' guide might help you, too: http://gmmentalgym.blogspot.com.au/

dates

#!/usr/bin/env ruby
require 'date'
require "highline/import"

begin

class Date
	def pretty_string
		months = [  nil,"January", "Febuary",
					"March","April","May",
					"June","July","August",
					"September","October","November",
					"December" 						]

		return "#{months[self.month]} #{self.day}, #{self.year}"
	end

	def wday_string
		days = ["Sunday","Monday","Tuesday","Wednesday","Thursday","Friday","Saturday"]
		return days[self.wday]
	end
end

def dateRand (date1, date2)
	date1,date2 = *[date1, date2].map {|x| x.to_time}
	Time.at((date2.to_f - date1.to_f)*rand + date1.to_f)
end

asking = true
while asking do
	rand = dateRand(Date.new(1600,1,1), Date.new(2099,12,31)).to_date
	puts rand.pretty_string

	incorrect = true
	while incorrect do
		response = ask("Weekday code: ", Integer) {|response| response.validate = /\d+/}
		if response == rand.wday
			puts " => Correct: it's a #{rand.wday_string}"
			incorrect = false
		else
			puts " => Wrong. Try again below."
		end
	end
end

rescue Interrupt => e
	exit
end