Hi @Anonymous ,
Have you got this resolved? If not, I'm happy to help further.
I would suggest you display the 'Start - Date' Value from Excel table to a label by setting Text property to First('Table1').'Start - Date'.
Then you may find that the 'Start - Date' value is DateTime type and the time is 8:00 AM by default, even if the 'Start - Date' is formatted as Date in Excel.

Hence the filter code should be like this:
Filter(Table1,'Start - Date'=DateTimeValue(SelectedDate &" "& Time(8,0,0)))
Hope this helps.
Sik