Week Start Dating Not Calculating Correctly

[cheid_4838]

I am having issues calculating week start date and having two dates appear.  One is correct and the second is always the week prior as you will see in the screenshot.  I have a date table linked to the delivery date in the invoice header table.  WIth this relationship built I calcualted the week start date with the following formula: 

WEEK START DATE = 'delivery date'[Date]-weekday('delivery date'[Date],2)

I am not sure what could be driving this.  Is there something in the relationship that could be driving two two dates?  Thanks for your help.

[speedramps]

All reports use dates, so it is very important that power Bi developers learn how to use Calandar tables.

Try this ....

Click here to download PBIX from OneDrive 

How it works ...
Create a calendar table

Calendar =  CALENDAR(DATE(2023,01,01),DATE(2024,12,31))

Add a start of week column (I have used Monday)

Start of week = 'Calendar'[Date] - WEEKDAY('Calendar'[Date],2) + 1

Add a week offset column

Week offset = DATEDIFF(TODAY() - WEEKDAY(TODAY(),2) + 1,[Start of week],DAY) / 7

This will refresh each time your data is refeshed to give you the week offset 

Create Calandar date to Fact date one to many relationship

Build your report and add a filter to just shoiw the week offset you need.

This example just shows the last 5 weeks, but you can choose just one week if you wish

To learn more about Calendars watch these videos  
https://www.youtube.com/watch?v=BtYn1hfdSAM 

Thanks for the clear description of the problem with example data. I wish everyone did that!

Remember we are unpaid volunteers, and you have got free expert help which took a lot of effort,
This solution works and does exactly what you asked.
So please quickly click the [accept as solution] and the thumbs up button to leave kudos. 

One question per ticket please. If you need to change or extend your request then please raise a new ticket.

You will get a quicker response and each volunteer solver will get the kudos they deserve. Thank you ! 

If you quote @speedramps in your next tickets then I will then receive an automatic notification, and will be delighted to help you again.

Please now click the [accept as solution] and the thumbs up button.  Thank you.

[Greg_Deckler]

@cheid_4838 I don't understand what I am seeing exactly in the screen shot. Is your 11/12 correct and 11/19 incorrect or the other way around?

[cheid_4838]

11/19 is correct, but 11/12 is showing up.  That was an important piece of information if left out. 🙂

[Greg_Deckler]

@cheid_4838 OK, I *think* the issue is that the way you have your formula written, 1/19/2023 will have a start date of 1/12/2023 (1/19/2023 - 7 = 1/12/2023). I think that has something to do with it but very difficult to tell as I don't really have much context as to what is what in that visual and where things are coming from.

[speedramps]

@Greg_Deckler 

Hi Greg

Firstly, many thanks to all the help you give members.

I think the solution is a Calendar table with a week offset.

It is best practice to use a Calendar with offsets to show current week, current month, current quarter and current year.

See the example solution I posted.

It works and took me a lot of effort to write, so I hope it is accepted as the solution. Thanks.