import { parse } from 'date-fns';
import validate from './validate';

/**
 * 获取出生日期
 * @param {string} idCardNum - 身份证号码
 * @return {Date|null} - 出生日期
 */
const birthDate = (idCardNum: string): Date | null => {
  if (validate(idCardNum)) {
    const birthDateString = `${idCardNum.substring(6, 14)}+00`;
    return parse(birthDateString, 'yyyyMMddX', new Date());
  }
  return null;
};

export default birthDate;