Reduce time in time picker . planner app for student

MIT App Inventor Help
1

I want to subtract the start time from the end time to get the remaining time.
planner (1).aia (141.8 KB)

2

Why do you first announce that you solved the spinner problem and then open a new topic?

3

I solved that

4

I understand that the problem presented in this post has been solved?

5

Duplicate topic, and has been resolved.