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Find my approach as reference below and stored in attached workbok version 10.3 located in the original thread
Rolling 12 month calculation: WINDOW_SUM(SUM([Sales]), -11,0)
Hope it helps,
Thank you so much Norbert! I used the calculation and compute using Order Date and it worked perfectly. I just have one more question. Is it possible to calculate the percentage difference between blue and yellow bars starting from this Rolling 12 months calculation?
You are welcome. Glad it worked out perfectly.
Concerning your next question: Please check the following thread on Quick Table Calculations in Tableau
Hope it helps.