running numerical value based on rolling previous 12 months

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I have an excel file of flight time entered by date and aircraft type. I need a cell that shows the rolling total time for the previous 12 months for two different aircraft. not sure how to add in the time requirement. 

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@agfueler  Similar to how you did total times for each plane type using SUMIF, you just change to SUMIFS and add an additional condition for within 1 year.  For simplicity I did 365 days but if you have to do exactly 1 year it could be tweaked: