Referencing attached...I need to sum the values in column for the 12 months starting with the MOST RECENT ENTRY (in this case Jul, 2013 - August 2012). The values will be scattered, not in chrono order. The most recent date may not be the first one encountered. So I'll need to check to find the most recent date, use it as month 1 and then sum the values from month 1 through 12.
The day of the month isn't important so column K could be used to check the date.
Need it in a formula. Any suggestions?
(I'll also need to sum the values for months 13-24 but I can probably tackle that if I can get the formula for months 1-12.)