Hi Amit Kumar,
Please have a look at the workbook I've attached.
You have to right click on "Ship Date" and "Order date" separately, you hold the right click and drop it after Order ID.
Here a pop up appears, you need to select "MDY". It stands for Month Day Year.Here you go.
Regarding the second question, please check the workbook.
This should help both of your issues.
Have a nice week!
Amit Kumar.twbx 80.1 KB