#!/usr/bin/env ruby
# -*- coding: utf-8 -*-

require'date'

require'date'
head = Date.today.strftime("%B, %Y")
year = Date.today.year
mon = Date.today.mon

firstday_wday = Date.new(year,mon,1).wday
lastday_date = Date.new(year,mon,-1).day
week = %w(Su Mo Tu We Th Fr Sa)

puts head.center(20)
puts week.join(" ")
print "   " * firstday_wday
wday = firstday_wday
(1..lastday_date).each do |date|
  print date.to_s.rjust(2) + " "
  wday = wday+1

  if wday%7==0
    print "\n"
  end
end