Many thanks. I looked at a variety of questions and responses and have
solved my problem. Your response put me on the right track though. I now
havea column of figures that keeps changing into date mode without being
formatted as a date. How do I keep this column as numbers only, please?
It stays as numbers if I put alpha letters in front but I would prefer to use
just numbers?

"Rowan Drummond" wrote:

If you have the Analysis Toolpak addin installed you could use the edate
function which allows you to add months to a date. For subtracting days
and weeks just use -1 or -7 etc. So if you had 11.10.2005 in A1:
=EDATE(A1,36)-1
would return 10.10.2008.

Hope this helps
Rowan

rostroncarlyle wrote:
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