Day and Time Relative to the Start of the Week

[Nathaniel1307]

I work in the events industry and want to analyse ticket sales over time but then compare these to the previous week.

We release our tickets for that weeks events on Monday Afternoon. The dataset coming into power bi is a transaction report for each ticket sale and gives a date and time for the sale.

I currently have a line chart showing ticket sales over time split by event but when I want to compare this weeks sales to last weeks theyre not overlaid on a line chart as the sales are a week later which leads to a chart like the below:

I want a way to see each weeks sales over time overlaid on top of each other.

Any assistance would be greatly appreciated!

[Villezekeviking]

You can also use a combination of a calendar table in DAX I've made with Selectedvalue.

Both are described in these 2 posts.

https://www.villezekeviking.com/dax-magic-with-selectedvalue/
https://www.villezekeviking.com/dax-tables-calendar-and-time/

[jdbuchanan71]

What about adding a Sales Day column to your data that calculates the number of days since the first sale for that event.  Then you can make the Sales Day the X axis on your chart and that would align events from different weeks together.

Sales Day = 
VAR _SalesStart =
    CALCULATE ( MIN ( 'YourTable'[Date] ), ALLEXCEPT ( 'YourTable', 'YourTable'[Event] ) )
RETURN
    'YourTable'[Date] - _SalesStart + 1

You can see that the Sales Day goes from 1 - 5 for both events even though the first sales for that event was on differnet days.

You can see how they stack together with the Sales Day as the x axis.  You could also have a date filter on the page to only look at events in a certain date range to filter it down.