That's the idea driving agile product development: defining and estimating big projects is hard, so let's do many small projects (sprints). If the stakeholders

That's the idea driving agile product development: defining and estimating big projects is hard, so let's do many small projects (sprints). If the stakeholders have a hard deadline, you can ship whatever you have then because your product is supposed to be in a shippable state, though possibly with reduced functionality, at the end of each sprint.