Calculate days between dates: Project duration

What this Python exercise asks you to practise

This scenario tests calculate days between dates. It belongs to the Files, Text Data, Exceptions, and Modules roadmap and uses the open or parse safely → validate → handle failure → produce result pattern.

Process file-like text safely and use Python's csv, json, datetime, pathlib, and exception tools.

Skills and reported company tags

Interview platforms and learner reports associate this problem family with the companies below. Tags are preparation signals, not a guarantee that an identical question will appear.