With JIRA software v. 8.12.1 (Server edition), when I start a new sprint and enter start and end dates, the Start Sprint dialog shows the number of days in the sprint as one less than it should.
For example, if I set the start date to Monday 9:00am and the end date to Friday 6:00pm three weeks later, the number of days should be 15, but the Start Sprint dialog shows that the sprint contains 14 days. Then, if I block out one day as a corporate holiday, it shows 12 days instead of 14! Is this a bug? How do I work around it?