code: function getMultiplier(_ref2) {
    var operator_keyword = _ref2.operator_keyword,
        post_keyword = _ref2.post_keyword;
    return operator_keyword === '-' || post_keyword === 'ago' ? -1 : 1;
  }
docs: Gets multiplier based on whether the value is in past or future.
  @param {object} config
  @param {operator_keyword} config.operator_keyword
  @param {post_keyword} config.post_keyword
  @return {number}