Sorting time in ascending order in seconds, and adding time

I created an app that takes a hh:mm input and converts it to seconds, then sorts it in order in a list in seconds.

This then allows the app to add all of the time you entered and present it to you in a Label to 2 decimal places.

Here is the project link.

I am sure there are other ways of doing this, but here is mines!

Let me know what you think, of if you maybe find this useful.