Dates between generic set of dates

[yve214]

Hi,

I was trying to calculate for the qty between dates from the last 4 weeks (28 days) to a selected date.

I tried using the dateadd function to specify the range but it didnt work.. 

this is what I have so far

Qty last 4 weeks = calculate(sum(data[qty], datesbetween(data[date], dateadd(data[date], -28, days]),  dateadd(data[date], 0, days])

To get the aggregated qty for the past 4 weeks (monday through saturday) from the date selected on my filter.

seems I cant use the dateadd function to call out a sepecific for datesbetween. 

Please can anyone help? Thank you very much.

[v-shex-msft]

Hi @yve214,

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Xiaoxin Sheng

[amitchandak · Accepted solution]

@yve214 , if you need rolling 28 days

Rolling 28 = CALCULATE(sum(Sales[Sales Amount]),DATESINPERIOD('Date'[Date ],MAX('Date'[Date ]),-28,DAY))

if you need 4 weeks, You need the following columns in your date table

new columns
Week Start date = 'Date'[Date]+-1*WEEKDAY('Date'[Date],2)+1
Week End date = 'Date'[Date]+ 7-1*WEEKDAY('Date'[Date],2)
Week Rank = RANKX(all('Date'),'Date'[Week Start date],,ASC,Dense)
OR
Week Rank = RANKX(all('Date'),'Date'[Year Week],,ASC,Dense) //YYYYWW format

measure

Last 4 weeks = CALCULATE(sum('Table'[Qty]), FILTER(ALL('Date'),'Date'[Week Rank]>=max('Date'[Week Rank])-4 && 'Date'[Week Rank]<=max('Date'[Week Rank])))

or

Last 4 weeks =
var _max1 = maxx(allselected('Table'), 'Table'[date])
var _max = maxx(filter(all(date), date[date] = _max1), week[Rank])
return
CALCULATE(sum('Table'[Qty]), FILTER(ALL('Date'),'Date'[Week Rank]>=_max-4 && 'Date'[Week Rank]<=_max))

Power BI — Week on Week and WTD
https://medium.com/@amitchandak.1978/power-bi-wtd-questions-time-intelligence-4-5-98c30fab69d3
https://community.powerbi.com/t5/Community-Blog/Week-Is-Not-So-Weak-WTD-Last-WTD-and-This-Week-vs-La...
https://www.youtube.com/watch?v=pnAesWxYgJ8