C# 通过身份证查询出生日期

 1 private int GetAgeBycode(string b_car_code)
 2         {
 3             string birthday = "";
 4             //处理18位的身份证号码从号码中得到生日和性别代码
 5             if (b_car_code.Length == 18)
 6             {
 7                 birthday = b_car_code.Substring(6, 4) + "-" + b_car_code.Substring(10, 2) + "-" + b_car_code.Substring(12, 2);
 8             }
 9             //处理15位的身份证号码从号码中得到生日和性别代码
10             if (b_car_code.Length == 15)
11             {
12                 birthday = "19" + b_car_code.Substring(6, 2) + "-" + b_car_code.Substring(8, 2) + "-" + b_car_code.Substring(10, 2);
13             }
14             return birthday;
15 
16         }