Sijia618

Results 2 issues of Sijia618

Percentage and date fields are displayed as strings

![Capture3](https://user-images.githubusercontent.com/67002961/84769063-2e68d480-afcd-11ea-95c8-279d097e4986.PNG) ![Capture4](https://user-images.githubusercontent.com/67002961/84769070-30329800-afcd-11ea-80ff-b5a28da8e96a.PNG)

User experience error messages when opening the CSV file

![1](https://user-images.githubusercontent.com/67002961/84768954-01b4bd00-afcd-11ea-914c-8741eecd4949.PNG) ![2](https://user-images.githubusercontent.com/67002961/84768959-037e8080-afcd-11ea-9096-3f2ee4cf4cea.PNG) ![3](https://user-images.githubusercontent.com/67002961/84768962-05484400-afcd-11ea-9d08-39b0a03d3674.PNG)