Help with Week Ending Date DAX Column

[Anonymous]

Hello,

Hopefully this is an easy one. I have the following column in my date table, which I use to calculate the last day of the week for each row:

End of Week = 
VAR DayNumberOfWeek = WEEKDAY(LASTDATE('Date Table'[Date]),3)
RETURN
DATEADD(
    'Date Table'[Date],
    6 - DayNumberOfWeek,
    DAY)

 This works fine, except the current week:

I can't figure out how the DAX code above results in a blank value for this column. In this example, I would have thought that the Date (Monday 1st march) would have 6 - the day number (0) = 6 days added, resulting in Sunday 7th March.

However, the value is blank.

Why is this, and how can I make it so this value is not blank?

[Ashish_Mathur · Accepted solution]

Hi,

This calculated column formula should work

='Date Table'[Date] + (7 - WEEKDAY('Date Table'[Date],2))

[Anonymous]

Perfect, thanks. Much simpler than my previous formula, which I adapted from forumula to get week start date, that I found in a blog post somehere.

[Ashish_Mathur]

You are welcome.

[HotChilli]

Does the date table end before 7th March? The results from DATEADD have to be in the dates column, so to solve it you can construct the date without using dateadd or extend the date table  

[Anonymous]

@HotChilli  Thanks for your response.

The date range of the date table is taken from the earliest and latest dates in a date column from a fact table of timesheet data. So as it is now, the last date in the date table will never be later than the current day.

I can easily edit the date table in PQ to go a bit further into the future, but I would be interested to know how I could do a similar calculation to achieve the desired result without needing to do that (out of curiosity)?