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jpereztang Regular Visitor
Regular Visitor

Weekday Last Year Comparison

Hi everybody !

 

I have a requeriment that i don't know how to achieve. Question is simple, how can I compare this year sales with exactly the same weekday sales of last year. take for instance, Today is July 1st 2016 i must compare today sales with sales on 29th June 2015 because this two days are monday of the same week.

 

You can think that's piece of cake, just DATEADD -365 days or DATEADD -1 year but I have to say there are some years that doesn't have 365days. For instance, this febrary have 29 days and febrary of last year have just 28, aka leap-year.

I think this could resolve my problem but actually dax doesn't accept 'week' as parameter

 

Ventas cliente preferente YTD:=CALCULATE(
                                                                          [Ventas cliente preferente]
                                                                         , DATEADD(Tiempo[Fecha],-52,week)
)

I hope you can help me 

Thanks in advance

 

 

 

12 REPLIES 12
Super User
Super User

Re: Weekday Last Year Comparison

hi @jpereztang

 

If today is July 1st 2016; A year ago was July 3th 2015.

 

 




Lima - Peru
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Super User
Super User

Re: Weekday Last Year Comparison

the dax maybe was:

 

Calendar[Date] - 364

 




Lima - Peru
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jpereztang Regular Visitor
Regular Visitor

Re: Weekday Last Year Comparison

Hi @Vvelarde, yep you're right it was 3th July 2015 I confused it with August.

 

About your answer, It work for this year, but what happen if the year is a leap-year? It has 366 days and a normal year has 365. It have to be dynamic or something like that. My solution have to work to infinity and beyond

donsvensen Member
Member

Re: Weekday Last Year Comparison

Hi

 

A leep year still has 52 weeks so you will hit the same weekday.

 

But in years with 53 weeks you have to decide whether you want to go 364 days (52*7) back or (53*7) - the easy way is always to use 364 (52*7) :-)

 

br

Erik

AlexChen Member
Member

Re: Weekday Last Year Comparison

Hi,

 

I want to know if your Tiempo[Fecha] is continuous date or not.

 

If it’s continuous date you can create a measure like below:

 

Measure yourMeasure = CALCULATE(SUM('Tiempo'[yourColumn]),SAMEPERIODLASTYEAR('Tiempo'[Fecha]))

 

When you use filter on this measure, remember to remove date hierarchy, just use date.

 

On the other way, if your Tiempo[Fecha] is not continuous date, there is not way to come to that result you want.

 

Best Regards

Alex

Super User
Super User

Re: Weekday Last Year Comparison

@jpereztang

 

One solution that came to mind is on the date (calendar) table

 

1. create a  column WeekNo= Weeknum([Calendar[FullDate])   ( Full Date is the Date column in DD/MM/YYYY format)

2. Create a column WeekDayNo = WeekDay(Calendar([FullDate])

3. Create a column Year = Year(Calendar[FullDate])

4. Create a column DWY = ([WeekDayNo]*100+[WeekNo])*10000+[Year] . This will create numbers like 5012015, 5012016, etc. etc

    depending on the Date.

5. Join your fact table to the Calendar table

6. Create a measure sya for Sales = sum(Facttable[SalesAmount])

7. Create a measure to compute the sales for same day same week last year as

     SalesLYDWY = Calculate([Sales], Filter(ALL(Calendar),Calendar[DWY] = Max( Calendar[DWY]) -1 ))

8. You should now be able to view the Sales and SalesLYDWY side by side.

Sample of what I did

 Column Labels             
 1 2 3 4 5 6 7 
Row LabelsSales2SWLYSales2SWLYSales2SWLYSales2SWLYSales2SWLYSales2SWLYSales2SWLY
2015              
24          41 43 
2545 47 49 51 53 55 57 
2659 61 63 65 67 69 71 
2773             
2015 Total177 108 112 116 120 165 171 
2016              
24           41 43
254145434745494751495351555357
265559576159636165636765696771
27697371 73         
2016 Total165 171 177 108 112 116 120 

 

This should work for all years and weeks for eternity.

 

If this solves your requirement please accept this as a solution and also give KUDOS.

 

Cheers

CheenuSing

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Mikkelnaes Frequent Visitor
Frequent Visitor

Re: Weekday Last Year Comparison

Dear @CheenuSing

 

Thank you, this is great. 

 

The only challenge I have is that my last year based on your number. 7 has one drawback. 

 

Net Sales LY test = CALCULATE([Net Sales test];FILTER(ALL('TestDWH Date');'TestDWH Date'[DWY] = MAX('TestDWH Date'[DWY])-1))

 

When I have it on days, i.e. monday, tuesday etc, my "total" row in f.ex. a table only show value for sunday LY. Do I need any IF statement? 

 

Thank you,

Mikkel 

Super User
Super User

Re: Weekday Last Year Comparison

Hi @Mikkelnaes

 

Could you please post your pbix in one drive / google drive and share the link.

 

Please also explain what is not working correctly.

 

Cheers

 

CheenuSing

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VijayReddy Frequent Visitor
Frequent Visitor

Re: Weekday Last Year Comparison

Hi CheenuSingh,

 

Just wondering why you would multiply WeekDayNo by 100? Please could you explain?

Thank you

Vijay