I would like to be able to create a formula for an Excel worksheet using a
list of dates and then subtracting one day and adding 3 years, 2 years, 2
years 3 months, 2 years 6 months and 3 years less 1 week to their respective
columns

For example, 11.10.2005 is given date
Then 10.10.2008, 10.10.2007, 10.01.008 and 03.10.2008