Powerpivot: year to date vs year to date previous year - powerpivot

I am using excel 2013 powerpivot which I have linked to a sql query. In this query I have all sales data from previous years and it updates itself with the current sales. I want to make a pivottable showing year to date sales from this year compared to the same period last year. So for example from Jan.1st 2015 until July 10th of 2015 compared to Jan.1st 2014 until July 10th 2014.
I linked my sales data table with a calendar table. But whatever I try, parallelperiod, sameperiodlastyear, totalytd, it always shows me the correct data for this year, but the full year sales of last year. Can anyone recommend me what to try?
thanks,
Frank

The TOTALYTD (and other time intelligence functions) will look for the highest date in whichever context you give it, so when you try to tell it to go back 12 months from now it thinks "OK, I'm in 2014" I'll get ALL the data from 2014 and calculate a TOTALYTD. So you have to ignore the built-in functions and build your own:
=CALCULATE(sum(Table1[sales]),DATESBETWEEN(DateDim[Date], FIRSTDATE(DATEADD(DateDim[Date],-12,MONTH)), LASTDATE(DATEADD(Table1[Date],-12,MONTH))))
So long as you have a slicer or a field on your table that picks up the year, then that should work.
Edit: Having tested with a data sample, again DAX is trying to be too clever and because I have told it to go back 12 MONTHS, it assumes I want ALL data from the month context which is including everything from July last year.
Going back 365 days fixes this (as long as it's not a problem for leap years).
=CALCULATE(sum(Table1[sales]),DATESBETWEEN(DateDim[Date], FIRSTDATE(DATEADD(DateDim[Date],-12,MONTH)), LASTDATE(DATEADD(Table1[Date],-365,DAY))))

I have tried your way, but it does not yet give me the correct answer. Let me show you what I have right now.
For current year sale I have the following Dax formula
=TOTALYTD(sum(Omzetgegevens[NettoOmzet]); Kalender[Calender date])
For the previous year sale I have:
=CALCULATE((SUM(Omzetgegevens[NettoOmzet])); SAMEPERIODLASTYEAR(DATESYTD(Kalender[Calender date])))
To test your solution I have called "test ytd":
=CALCULATE(SUM(Omzetgegevens[NettoOmzet]); DATESBETWEEN(Kalender[Calender date]; FIRSTDATE(DATEADD(Kalender[Calender date];-12; MONTH)); LASTDATE(DATEADD(Kalender[Calender date]; -365; DAY))))
If I run the pivottable now, the result I get is:
2015
current year ytd last year ytd test ytd
januari 28.912 34.487 34.487
februari 50.301 66.003 31.516
maart 73.362 92.647 26.644
april 99.561 117.853 25.205
mei 128.021 149.108 31.255
juni 149.706 174.076 24.968
juli 158.297 205.438 31.362
augustus 158.297 231.693 26.255
september 158.297 254.534 22.841
oktober 158.297 282.484 27.951
november 158.297 303.808 21.324
december 158.297 313.208 9.400
Total 158.297 313.208 313.208
What I would like to see is the following. As this report was run on the 14th of july 2015. I want to see all sales for 2015 until this date and all the sales for 2014 until july 14th 2014.
If it is not possible to see the months, I am also fine with only a total number for current ytd and last year ytd
2015
current year ytd last year ytd
januari 28.912 34.487
februari 50.301 66.003
maart 73.362 92.647
april 99.561 117.853
mei 128.021 149.108
juni 149.706 174.076
juli 158.297 175.312(so not full month of july in 2014)
Total 158.297 175.312

Recently had a similar issue. Current context confuse a lot and did not return the result we think should be returned. Play with DATEADD to go back and forth in combination with any of the date/time function. You will get the result and the context will also be clear.

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Very similar to this question.
Do you have a Date Dimension in your model?
TotalQuantity =
SUM(Bookscan[QtySold])
TotalQuantity YTD =
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PROC SQL;
CREATE TABLE test AS
select *
FROM bondprice as a, sdc as b
where b.Participant_CUSIP=a.cusip
& INTCK('MONTH',b.Alliance_Date,a.time)>=-1
& INTCK('MONTH',b.Alliance_Date,a.time)<=1 ;
QUIT;
DATA test1;
SET test;
BY deal_number CUSIP code time;
IF first.code THEN price1=price;
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So the first part of code is not accurate (the >= and <= range): it yields any prices that falls into December 2009 to Feb 2010, this is wrong because of two situations. First, if the bond prices stops in between Dec 2009 and Jan 2010, it will be counting as a valid 2-month and 3-month observations. Second, if the bond prices begins in between Jan 2010 and Feb 2010, it will be counting as a valid 3-month observation. Both of these two situation will yield invalid observations, since the first situation do not have Feb 2010 prices but still counts as 2-month and 3-month, and the second situation do not have either Dec 2009 or Jan 2010 prices, but still counts as 3-month.
Will someone help me with this? How can I modify the code so that the 3-month window and 2-month window contains the relative months?
I hope I describe the problem clearly. Please let me know if anything is unclear.
I've uploaded an example to this problem here.
https://www.dropbox.com/s/hx9ahst7nts4k0q/ex1.xlsx?dl=0

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KPI View
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e.g
if ran today (23/03/2016)
march 2016 would be the sum of all the results from april 2015 to 23 march 2016
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and so on...
Thank you in advance.
I would consider window function. For example, generating running total of AvailableHours:
sum(AvailableHours)over(order by calendarshortyearmonth asc) as run_total_AvailableHours

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In order to compare revenues or other financial metrics among these companies, I need to be able to convert each fiscal period into equivalent calendar periods. For instance, someone might ask, how much revenue each company generated in calendar year 2011.
In the case of Apple Corp., we would need to remove the revenues which have been generated in calendar period 2010, which would equal Apple's fourth quarter of FY2010 and add the first quarter of fiscal year 2012 (which ended December 2011).
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What would be the most efficient and short algorithm I could accomplish this?
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This is more of a financial question then technical question.
If you have end of year results only, there is no practical way you could compare unless they are for same financial period.
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I would suggest that you should try to compare those results which yields more meaningful results.