Measure that divides current month and next month

[Anonymous]

Hello Everyone, 
I'm working in a report of sales and I'm trying to use a measure to calculate days of stock. 

I have one table of sales and other table of stocks. 

Days Of Stock are calculated this way

Days Of Sotck= total sales of last month/total stock of current month. 

I built this measure but it does this operation with current month 

Dias de Inventario = iferror(sum(Consolidado2018[UNIDADES])/sum(StockConsolidado2[PZAS]),0)*30

Consolidado is for the sales of the month and Stock is for the productos in storage. 

I think is importan to mention that I have date table-

Hope you can help me. 

Thank You.   

[Greg_Deckler]

See if my Time Intelligence the Hard Way provides a different way of accomplishing what you are going for.

https://community.powerbi.com/t5/Quick-Measures-Gallery/Time-Intelligence-quot-The-Hard-Way-quot-TIT...