conference date string refactor

original.rb

def conference_date_string(conf)
  startstr = "Unknown - "
  endstr = "Unknown"
  # When the conference in the same motn
  if conf.start_date.month == conf.end_date.month and conf.start_date.year == conf.end_date.year
    startstr = conf.start_date.strftime("%B %d - ")
    endstr = conf.end_date.strftime("%d, %Y")
  elsif conf.start_date.month != conf.end_date.month && conf.start_date.year == conf.end_date.year
    startstr = conf.start_date.strftime("%B %d - ")
    endstr = conf.end_date.strftime("%B %d, %Y")
  else
    startstr = conf.start_date.strftime("%B %d, %Y - ")
    endstr = conf.end_date.strftime("%B %d, %Y")
  end

  result = startstr + endstr
  result
end

refactored.rb

def conference_date_string(conf)
  date_string(conf.start_date, conf.end_date)
end

def date_string(start_date, end_date)
  startstr = 'Unknown - '
  endstr = 'Unknown'
  # When the conference in the same motn
  if start_date.month == end_date.month && start_date.year == end_date.year
    startstr = start_date.strftime('%B %d - ')
    endstr = end_date.strftime('%d, %Y')
  elsif start_date.month != end_date.month && start_date.year == end_date.year
    startstr = start_date.strftime('%B %d - ')
    endstr = end_date.strftime('%B %d, %Y')
  else
    startstr = start_date.strftime('%B %d, %Y - ')
    endstr = end_date.strftime('%B %d, %Y')
  end

  result = startstr + endstr
  result
end