Current Behavior:
Currently, the JIRA Agile Days Remaining in Sprint gadget shows the days remaining as 0 during the last day of the sprint.

Situation:
For example, I have a sprint that ends on Tuesday. Although Tuesday is technically the last day of the sprint, the developers still have all day to complete their work. Therefore, there should never be a count of zero days left as that implies it is the start of the next sprint.

The thought process behind the current behavior is that, technically at the end of Tuesday there is no time left in the sprint, so therefore there are zero days remaining then.

Solution Suggested:
To avoid this, a potential fix could be updating the gadget to change to an hourly scale on the last day of the sprint. As time passes on the last day, devs will get a clear indication of how much time is left.