Those are the role playing dimensions.

You have the order date, the ship date and the due date.

This is realized by joining 3 times to the same date dimension, but each time using a different date column from the fact table.

OrderDateKey -- DateKey

ShipDateKey -- DateKey

DueDateKey -- DateKey

You could use 3 different views on top of the date dimension, but the result is the same.

When you create the cube, you add the date dimension three times as a cube dimension and there you can rename them as well.