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# Sum of last 12 months before the switchover month

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Userlevel 2
+3
• Seasoned Pigmenteer
• 15 replies

Hello, i would like to do the sum or the average of last 12 months before the switchover month.

Thanks for your help

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Best answer by Gawain 22 September 2023, 15:30

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### 3 replies

Userlevel 3
+4

Hi @Cedric LJ ,

I think this question has already been asked here:

@Khalid Awale gave a great explanation that I think should cover exactly what you need! Let us know if you have any questions!

-Mat

Userlevel 2
+3

Hi @Mat , I have checked the thread but it only mentions YTD , MTD or QTR metrics or maybe I have missed the point.
My request it to create a sum of a metrics based on the last 12 months before the switch over date.
For example if the switchover date is July 23 i want to sum all the months between July 22 and June 23.

Userlevel 4
+5

Hello,

One way to solve this would be to identify with a boolean the 12 Month before the switchover data. This can be done with this formula:
`If(MONTHDIF(Month.'End Date','Switchover date')<=12AND Month.'End Date'< 'Switchover date',true)`

You can then use this expression to filter your initial Metric and only keep the data on the last 12 Month. By finally removing your Month dimension you will have the sum you want.

The full formula could like this:
`‘Your Metric’[filter: If(MONTHDIF(Month.'End Date','Switchover date')<=12AND Month.'End Date'< 'Switchover date',true)][REMOVE SUM: Month]`

If your `‘Switchover date’` Metric is by Version, don’t forget to do `[ADD CONSTANT: Version]` to the `Month.’End Date’`  in the MONTHDIF function.

Hope it helps!