I see there is a standard formula and you just need to change the last number depending on the day of the week.
Date@row - WEEKDAY(Date@row) + 2
The "+ 2" can be modified to pick a different day of the week. 1 = Sunday, 3 = Tuesday, etc.
Here is the formula on my sheet but is shows #unparseable.
=Customer Date Needed@row - WEEKDAY(Customer Dated Needed@row) + 6
Thanks.