You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: count_down.rb
    path of file: ./repos/jruby/core/src/test/ruby/org/jruby/embed/ruby
    
    the code of the file until where you have to start completion: # count_down.rb [jruby-embed]
# jsr223.JRubyE
    
def count_down_birthday
  now = DateTime.now
  year = now.year
  days = DateTime.new(year, @month, @day).yday - now.yday
  if days < 0
    this_year = DateTime.new(year, 12, 31).yday - now.yday
    next_year = DateTime.new(year + 1, @month, @day).yday
    days = this_year + next_year
  end