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Frequent Visitor

## How to compare the same period of two different year

Hi everyone,

I would like to compare the same period of the current year and the prior year (example YTD march 23 - march 22).

Can I use the function PREVIOUSYEAR?

And how ?

6 REPLIES 6
Impactful Individual

@vr83 if the answer is correct, I ask you to accept it as a solution, otherwise I am available for further clarification.

BBF

Impactful Individual

@vr83 Hi!

Yes, you can use the PREVIOUSYEAR function in DAX to compare the same period of the current year and the prior year. Here is an example formula that you can use to achieve this:

YTD Prior Year =
CALCULATE(
[Total Sales],
PREVIOUSYEAR(Dates[Date]) <= Dates[Date] &&
YEAR(PREVIOUSYEAR(Dates[Date])) = YEAR(MAX(Dates[Date]))
)

The calculation is based on the following conditions:

• The date in the previous year must be less than or equal to the current date.
• The year of the previous year date must be the same as the year of the latest date in the Dates table.

You will need to replace `[Total Sales]` with your own measure and `Dates[Date]` with your own date column.

BBF

Frequent Visitor
Hi BeaBF,

homestly I don't know why it doesn't work.

Probably because my record are maybe different.

So in this case how can I write the correct formula using what you've write?

YTD Prior Year =
CALCULATE(
[Total Sales],
PREVIOUSYEAR(Dates[Date]) <= Dates[Date] &&
YEAR(PREVIOUSYEAR(Dates[Date])) = YEAR(MAX(Dates[Date]))
)

Thansk

Impactful Individual

@vr83  Ok and do you have another column with the YTD? or FY is your YTD?

Impactful Individual

@vr83 Firstly, you have to create a column with only the Year and one with only the Month:

YEAR = LEFT(Table[MESI], 4)
MONTH = RIGHT(Table[MESI], 2)
then, you can create this measure:
Delta_YTD =
VAR CurrentMonth = SELECTEDVALUE(Table[MONTH])
VAR PrevMonth = CurrentMonth - 1
VAR CurrentYear = SELECTEDVALUE(Table[YEAR])
VAR PrevYear = CurrentYear - 1
RETURN
CALCULATE([YTD],
FILTER(ALL(Table), Table[Month]= CurrentMonth &&
Table[Year]= CurrentYear)) -
CALCULATE([YTD],
FILTER(ALL(Table), Table[Month]= CurrentMonth &&
Table[Year]= PrevYear))
where YTD is your YTD Value.
BBF
Frequent Visitor

Hi,

I've tried the formula but it doesn't work...

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