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Problem
The start and finish hours/minutes/seconds were being subtracted from each other.
"finishSeconds - startSeconds"
And then I combined that into a string again and send it to the backend.
This would create times like 00:10:-40
Which is not what we want for obvious reasons.
Solution
I split up the time strings in start and finish and turn each string number into an integer.
Then I turn all numbers into seconds and add those together.
So 10 hours will become 10h * 3600s = 36000 seconds.. etc.
After that I can subtract one from the other and use calculations to turn the time that was used back into hours, minutes and seconds.
Which are then send to the backend, together with the rest again.