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Tableau will not create data values outside the range of the content of the actual data. There are many ways to fill in missing months on a range but in this case you are looking to add months at the beginning or end for which there is no data. One potential solution (depending on your data structure) is to create a linking data source that contains a date field inclusive of all of the data in your data source and the current months where no data exists. Utilize the data source as a primary data source then link in the dates and measures from the secondary data source (your incomplete data) to create the view. It might also just be easier to create a null value row per month so that at least one record exists per month.
For domain padding missing dates between a start and end, you could utilize the approach mentioned here: Domain Padding outside range In this example, there is at least one data row for the max date so filling in the date values for the other dimensions was possible.
I hope that helps.