Google Spreadsheet, finding the previous weekday

Question

In Google Spreadsheet, or excel if its the same, how do I find the last weekday of day D only if D is not a weekday itself.

I.E:

If D equals weekday = do         


        

Answer 1

Another option may be:

=IF(WEEKDAY(D1, 2) > 5, D1 - (WEEKDAY(D1, 2) - 5), D1)