Unexpected behaviour when process time crosses over day

[kmteras]

Describe the bug
The doughnut, bar chart and processes view do not display the time crossed over into the other day.

To Reproduce
Steps to reproduce the behavior:

1. Have a heartbeat start tracking on one day and end on the other.

Expected behavior
The times for the start day should limit the time to the maximum possible time possible in that day.
For example: a heartbeat starts at 23:55 and elapses 1 hour. The start day should only show the 5 minutes and the rest should be shown for the next day.