Pivot Sort Not Working as Expected

I am not able to sort the pivot table by a date field (Finish Date).

I have tried:
1) click the column and select SORT (oldest to newest)
2) Added the date column to the VAlues (as a number), Click it and selected Sort
3) Added a new column that is the same for all rows, and then selected --> Sort --> More Sort Options --> Ascending by Finish Date

None of these worked for me. I know I am missing something basic.

I attached a simplified version (with slicer).

Any help would be appreciated !

Thank you,
John