I was amused by the layout of the Today Pane in Thunderbird, when I noticed that 'Monday, 12 March 2018' appears 5 times, once for each event item on that date. It seemed more logical to me, that the date would appear once, and all the events would be listed under that specific date. Although the last entry has a time, so even if that one was split away, then it could be 2 instances instead of 5. It just looks a bit odd because this specific date has 4 day-long events.