Is there a twbx you can attach? Where do you want the labels to be displayed?
The labels are part of a view or sheet and this view is on a dashboard. See attached snapshot how i'm showing the Previous Month and Start Month. These are calculations which i have mentioned earlier. Instead of Previous month and Start Month it has to show Nov '15 and Sep '15 respectively.
Prev & Start.JPG 29.3 KB
You could make sure you return a date useing the DATEADD() function and then format the date to whatever you want
The first column is [Order Date] from the Super Store dataset, Previous Month and Three Months Ago are calculated fields I created. The previous month is normal, the three months ago is commented out just so that you can see it. You can insert that snipped into your IF-ELSE statements.
This SHOULD give you the answer you want...