DAX: Previousmonth / parallelperiod / dateadd doesn't work

[RemiAnthonise]

I've made a table and I've added some fields to calculate total sales per month and Month over month compare, see image below.

I've used these formulas:

Total Sales = SUM(ProjectPostTransViews[TotalSalesAmount])

Total Sales vorige maand = CALCULATE(ProjectPostTransViews[Total Sales]; PARALLELPERIOD('Calendar'[Date]; -1; MONTH))

Total Sales vorige maand2 = CALCULATE(ProjectPostTransViews[Total Sales]; PREVIOUSMONTH('Calendar'[Date]))

Total Sales vorige maand3 = CALCULATE(ProjectPostTransViews[Total Sales]; DATEADD('Calendar'[Date]; -1; MONTH))

Calendar table = Calendar = CALENDAR (DATE (2016; 01; 01); DATE (2025; 12; 31))

I've treied the 3 formulas to see if, in some case, the outcome is different. It's not. But that's not the problem. My problem is that the values for all 3 'last month' formulas are the same as the total sales value for that month. 

What am I doing wrong?

[gooranga1 · Accepted solution]

Hi @RemiAnthonise,

It looks like it's the TRansactionDate in your ProjectPostTransViews as it's a datetime field with a time of 12:00:00 midday. So when you link the Calendar table to it it will return no values as these are just the date that will assume midnight.

Create a new column in the ProjectPostTransViews table like;

TransactionDateOnly = date(year(ProjectPostTransViews[TransactionDate]),month(ProjectPostTransViews[TransactionDate]),DAY(ProjectPostTransViews[TransactionDate]))

then join on that.

[RemiAnthonise]

@gooranga1 Yes, this did it! Thanks a lot, you made my day.

[abhi9255]

Can you try replacing semicolons with comma in your formula.

[RemiAnthonise]

@abhi9255 Unfortunately, that doesn't work.

[abhi9255]

Can you try this

Total Sales vorige maand3 = CALCULATE(ProjectPostTransViews[Total Sales],DATEADD('Calendar'[Date], -1, MONTH))

[RemiAnthonise]

@abhi9255 That's what I did, see the yellow bar with the corresponding error.

Currently, I'm checking my relationships between the tabels but I can't find something.

[v-jiascu-msft]

Hi @RemiAnthonise,

I wonder if you can share the file. You can keep the minimal size of the file that can show us the issue. You also can use a dummy file. Anyway, please keep your private data safe.

Best Regards,

Dale

[RemiAnthonise]

@v-jiascu-msft I think this will work.

url

Data is testdata so it's okay to share public. Thanks!

[RemiAnthonise]

In case someone had some time to check my .pbix, do you have any solution? I think it has something to do with the date table but I can't find the problem.

[gooranga1 · Accepted solution]

Hi @RemiAnthonise,

It looks like it's the TRansactionDate in your ProjectPostTransViews as it's a datetime field with a time of 12:00:00 midday. So when you link the Calendar table to it it will return no values as these are just the date that will assume midnight.

Create a new column in the ProjectPostTransViews table like;

TransactionDateOnly = date(year(ProjectPostTransViews[TransactionDate]),month(ProjectPostTransViews[TransactionDate]),DAY(ProjectPostTransViews[TransactionDate]))

then join on that.

[gooranga1 · Accepted solution]

And you will need to change what you grouping by in your matrix. So either create a new column on Calendar that is "maand nummer" or group by Jaar and Maand from Calendar.

[abhi9255]

observe the formula which i have provided in your screenshot I can see semicolons.

[v-jiascu-msft]

Hi @RemiAnthonise,

Can you share a dummy pbix file?

Did you create proper relationships?

Best Regards,

Dale