Problem

When creating a sprint, setting the start date past the end date will cause the calculation of working days remaining to state "This sprint contains 0 working days" instead of automatically re-calculating the number of working days.

Environment

Jira Software 8.21.0

Steps to Reproduce

1. Navigate to a Scrum board backlog
2. Click Create Sprint
3. For Duration, select 1, 2, or 3 weeks
4. Change the start date to a date that is later than the currently selected end date
5. The end date field will update correctly to reflect the new end date, but the working days calculation will state "This sprint contains 0 working days".

Expected Results

The working days value is correctly calculated when changing the start date to a value past the currently selected end date.

Actual Results

The end date value changes automatically, but the working days value is reported as '0'.

Workaround

Click the calendar icon next to the End Date box and manually select the end date, this action will recalculate the working days correctly.

Notes

The 0 working days messaging is only incorrect in the 'Create Sprint' screen, once you create the sprint, the duration of the sprint is represented correctly.