First Day Of The Month

[MrGlenn]

Hello,

I have these variables

VAR ReportEndOfMonth = EOMONTH(DATE (YEAR(TODAY()), MONTH(TODAY()) -1, DAY(TODAY()) ), 0)
VAR ReportStartOfMonth =  DATE (YEAR(ReportEndOfMonth), MONTH(ReportEndOfMonth) , DAY(1) )

ReportEndOfMonth gives me 31/07/2022, which is correct.
ReportStartOfMonth gives me 31/07/2022, which is wrong.

If I change ReportStartOfMonth to

VAR ReportStartOfMonth =  DATE (YEAR(ReportEndOfMonth), MONTH(ReportEndOfMonth) , DAY(2) )

 ReportStartOfMonth gives me 01/07/2022.

Ideas of what is going wrong?

[transform99]

DAX has its own DAY calculation:

DAY function (DAX) - DAX | Microsoft Docs

"Returns the day of the month, a number from 1 to 31."

To my understanding, you're feeding it DAY(1). The Serial codes are the same between Excel and PowerBI (e.g. 44617 = 25/02/2022).

What PowerBI is doing is taking this as [Serial Value 1] = 31/12/1899. That's returning DAY(31/12/1899) which returns the day of the month (31). This also explains why Serial Value 2 = 01/01/1900, and returns day of month (1).

A simple solution should be to amend your variable to this:

VAR ReportStartOfMonth =  DATE (YEAR(ReportEndOfMonth), MONTH(ReportEndOfMonth) , 1 )

[ribisht17 · Accepted solution]

@MrGlenn 

Inside DAY(), there should be a date or replace it with 1 only (instead of DAY(1))

Regards,

Ritesh

Mark my post as a solution if it helped you| Munde and Kudis (Ladies and Gentlemen) I like your Kudos!! !!
My YT Channel Dancing With Data !! Connect on Linkedin !!Power BI for Tableau Users