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Frequent Visitor

## Last Year Sales Data is Off By One Week

I have a matrix to compare the sales of the past week (week 37) and the same week last year as such:

`PY_SalesAmt = CALCULATE(sum(Sales[NetAmount]),DC03_Calendar[Fin_Year] = "2017")`

The problem I am encountering is that instead of pulling the data from last year week 37 it is pulling the data from last year week 38.

How can I make an adjustment so these dates line up properly? My last fiscal year is 53 weeks which i believe is the problem.

2 ACCEPTED SOLUTIONS
Employee

Hi @igibson,

According to my test, DATAADD and SAMEPERIODLASTYEAR both have a granularity of DAY. Maybe we have to get the same week by ourselves if you want the exact same week (same week number).

```CouldbeRight =
VAR currentWeeknum =
MIN ( 'Date'[Weeknum] )
VAR currentYear =
YEAR ( MIN ( 'Date'[Date] ) )
RETURN
CALCULATE (
FIRSTDATE ( 'Date'[Date] ),
FILTER (
ALL ( 'Date' ),
'Date'[Weeknum] = currentWeeknum
&& YEAR ( 'Date'[Date] )
= currentYear - 1
)
)```

As we can see from the picture, the first day of week 52 of 2010 is 12/19/2010, not 12/18/2010.

Best Regards!

Dale

Community Support Team _ Dale
If this post helps, then please consider Accept it as the solution to help the other members find it more quickly.
Frequent Visitor

A very simple soultion that I implemented was a change in the calendar. I simply used Fin_Week = WEEKNUM(DC03_Calendar[Date]+1,21).

4 REPLIES 4
Frequent Visitor

A very simple soultion that I implemented was a change in the calendar. I simply used Fin_Week = WEEKNUM(DC03_Calendar[Date]+1,21).

Employee

Hi @igibson,

Could you please mark the proper answer as solution or share the solution if it's convenient for you? That will be a big help to the others.

Best Regards!
Dale

Community Support Team _ Dale
If this post helps, then please consider Accept it as the solution to help the other members find it more quickly.
Employee

Hi @igibson,

According to my test, DATAADD and SAMEPERIODLASTYEAR both have a granularity of DAY. Maybe we have to get the same week by ourselves if you want the exact same week (same week number).

```CouldbeRight =
VAR currentWeeknum =
MIN ( 'Date'[Weeknum] )
VAR currentYear =
YEAR ( MIN ( 'Date'[Date] ) )
RETURN
CALCULATE (
FIRSTDATE ( 'Date'[Date] ),
FILTER (
ALL ( 'Date' ),
'Date'[Weeknum] = currentWeeknum
&& YEAR ( 'Date'[Date] )
= currentYear - 1
)
)```

As we can see from the picture, the first day of week 52 of 2010 is 12/19/2010, not 12/18/2010.

Best Regards!

Dale

Community Support Team _ Dale
If this post helps, then please consider Accept it as the solution to help the other members find it more quickly.
Super User

Hi,

If in your filter, you have chosen a specific date range, then use the SAMEPERIODLASTYEAR() function in the CALCULATE function.

Regards,
Ashish Mathur
http://www.ashishmathur.com

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