timesheet.rb

require 'date'

def print_timesheet(first, last)
  last_month = nil
  first.upto(last) do |cur|
    if last_month != cur.mon
      puts
      puts Date::MONTHNAMES[cur.mon]
      puts
      last_month = cur.mon
    end
    puts sprintf("%02d.%02d %03s\t 0\t-", cur.day, cur.mon, Date::ABBR_DAYNAMES[cur.wday])
    puts if cur.wday == 0
  end
end

print_timesheet Date.civil(2008, 05, 01), Date.civil(2009, 01, 01)