def handle_sm_sy(tokens, options)
      month = tokens[0].get_tag(ScalarMonth).type
      year = tokens[1].get_tag(ScalarYear).type
      handle_year_and_month(year, month)
    end
def handle_sm_sy(tokens, options)
      month = tokens[0].get_tag(ScalarMonth).type
      year = tokens[1].get_tag(ScalarYear).type
      handle_year_and_month(year, month)
    end
Handle scalar-month/scalar-year