Previous month name in a empty table

[ohb60]

Hi PBI expert,

I'm a beginner and I'm using Json file with relative date (month -1) and I'd like to find the name of the previous month from today's date...

So this is how I find the actual month...and it display "mars" (maybe not the best method...)
But what I want is to display "february" ...how can I do that ? 

= let
Source = Table.FromRows({{Date.MonthName(DateTime.LocalNow())}},{"Month"})
in
Source

[Greg_Deckler]

Try this:

Measure 2 = 
VAR __currentMonth = MONTH(EOMONTH(TODAY(),0))
VAR __previousMonth = IF(__currentMonth = 1,12,__currentMonth - 1)
VAR __previousYear = IF(__currentMonth = 1,YEAR(TODAY()) - 1,YEAR(TODAY()))
RETURN
FORMAT(DATE(__previousYear,__previousMonth,1),"mmm")

[ohb60]

---

@Greg_Deckler wrote:

Try this:

Measure 2 = 
VAR __currentMonth = MONTH(EOMONTH(TODAY(),0))
VAR __previousMonth = IF(__currentMonth = 1,12,__currentMonth - 1)
VAR __previousYear = IF(__currentMonth = 1,YEAR(TODAY()) - 1,YEAR(TODAY()))
RETURN
FORMAT(DATE(__previousYear,__previousMonth,1),"mmm")

---

Thank you Greg but it's not working for me...I have this error when I try to validate this new measure :

La syntaxe pour '.0' est incorrecte. (DAX(VAR __currentMonth = MONTH(EOMONTH(TODAY().0))VAR __previousMonth = IF(__currentMonth = 1.12,__currentMonth - 1)VAR __previousYear = IF(__currentMonth = 1.YEAR(TODAY()) - 1.YEAR(TODAY()))RETURNFORMAT(DATE(__previousYear,__previousMonth.1),"mmm"))).

[Greg_Deckler]

Does this have to be done in M or can you do it in DAX?

[ohb60]

Both method interest me but maybe I should say : the most simple one 🙂

[PattemManohar]

@ohb60  Please try this to get the previous month name 

Power Query Editor (M-Code)

= Table.AddColumn(#"Added Custom", "PrevMonth", each Date.MonthName(Date.AddMonths([hiredate],-1)))

DAX

PrevMon = FORMAT(EDATE(emp[hiredate],-1),"MMMM")

[ohb60]

---

@PattemManohar wrote:

@ohb60  Please try this to get the previous month name 

Power Query Editor (M-Code)

= Table.AddColumn(#"Added Custom", "PrevMonth", each Date.MonthName(Date.AddMonths([hiredate],-1)))

DAX

PrevMon = FORMAT(EDATE(emp[hiredate],-1),"MMMM")

---

Thank you for this but I can't make it work either : 

I wrote this in my new measure : 

PrevMon = FORMAT(EDATE(MAJ[Update];-1);"MMMM")

I got this error message : 

It is not possible to determine a single value for the 'Update' column of the 'Update' table. This can occur when a measurement formula refers to a column that contains many values, without specifying an aggregation such as min, max, count, or sum to obtain a single result.

Here's the code I have in my 'Update' column  : 

let
    Source = Table.FromRows({{DateTime.LocalNow()}},{"Update"})
in
    Source

[ohb60 · Accepted solution]

Finally I found something that works : 

PrevMon = FORMAT(EDATE(NOW();-1);"MMMM")

Thanks everyone !