I would like to be able to define start and end of a day.

Use case: We are running a huge regression test campaign during night starting at 20:00 h and lasting until the early morning around 4:00 h. Currently this means that the test trend charts show half of the tests of a campaign on one day, the other tests are shown for the next day. The exact time a test is executed is quite random and depends on node availability etc. So there is always a mixture of two campaigns per day and the graphs are misleading for us...