Relative Day DAX

[Asma]

Hello everyone, I need to create a column in a date table that show the relative day Number 

for exemple if the date of Today is 09/03/2017

If the day chosen is 09/03/2017 than Relative day Number = 0 

if the day chosen is 10/03/2017 than Relative day Number = 1

if the day chosen is 08/10/2017 than Relative day Number = -1

I already calculate the Relative Year Number = 'Dates'[Year]-YEAR(Now())

the Relative Month Number = 'Dates'[Month]-MONTH(Now()) + 12* 'Dates'[Relative Year Number]

and the Relative Quarter Number = 'Dates'[QuarterofYear]-MONTH(NOW()+2/3)+ 4* 'Dates'[Relative Year Number] and it's working.

Now I am trying to Calculate the Relative Day Number using the same methode  however - I can't figure out a way to count the number of days for each year and can't found a function that returns the number of Today of year ( a number from 1 to Number of days in the year)

Is there a way to create this in Power BI - using DAX (which I'm not familar with at all)

Any ideas, suggestions or points in the right direction - would be greatly appreciated!  

Thanks!

[v-huizhn-msft]

Hi @Asma,

Please try create a calculated column using the formula.

Relative day Number=IF(Dates[Date]=NOW(),0,IF(Dates[Date]>NOW(),1,-1))

If this doesn't resolve your issue, please share your sample data for further analysis.

Best Regards,
Angelia

[Asma]

@v-huizhn-msft Hi Angelia, thank you for your help but unfortunately your solution didn't work for me for the sample reason that my data has many years, and I want the relative Day number to be counted for any day of any year... Not only for the previous and the next days.

for exemple if the date of Today is 09/03/2017 and the day chosen is 09/03/2016 than Relative day Number = -365 .... and so on....

here a part of my database 

Best Regards,

Asma

[Asma · Accepted solution]

@v-huizhn-msft Well I found the solution, here it is 🙂 

Relative Day Number = IF('Dates'[Date]> TODAY();(DATEDIFF(TODAY();'Dates'[Date]; DAY ));-1 *(DATEDIFF('Dates'[Date];TODAY(); DAY )))

Thank you for your help