Product trend analysis

I don't think you need calculated columns.  If you have a product table, hopefully you can a column already in your data with the launch date.

Next you need some measures that will calculate what you need, which can do the time related math based on that date.  The measure would be designed to be used in a context where you are displaying information related to products, i.e. a table with each product listed,  or a graph with 1 row per product.

Here is a quick example that assumes:

• You have a date table called "Dates" with a date column called "Date"
• You have a product table called "Product" with a column called "LaunchDate"
• You have a SWAP rate measure already

Swap Rate 4 Months= var launchDate = FIRSTDATE('Product'[LaunchDate])
var result = CALCULATE(
	[SWAP],
	ALL('Dates'),
	DATESINPERIOD('Dates'[Date], launchDate, 4, MONTH)
)
RETURN
result