We are using TimeChart for visualization of Incoming and Outgoing traffic in our application. We observed that for 1 hour time range when we specify 5 minutes time unit we can see an empty spaces at the beginning and the end of the chart lines.
This situation can be visible in the below screenshot:

The same situation is also visible in examples from your documentation:

Link below:
The same situation appears also for a simple line chart:
I will be grateful for your interest.