Create Date column from Year and Month columns

[DSwezey]

I have a table with a column of Month NUmber and a column for Year. I want to make a date column for the 1st of the month. The new column I want to be formatted [Month Number]/1/[Year] 

Example: the second row is February 2021. I want the new date column to look like 2/1/2021.

[smpa01 · Accepted solution]

@DSwezey  this was to be done in PQ.

For DAX use this 

Column = DATE('Table'[Year],'Table'[Month Number],1)

[Maitreya10]

Here for the last date or maximum date, I want the last day of month instead of first day, eg if my data lies between Jan 2023 to Jan 2024, I want all records between Jan 2023 to Dec 2023 to show date for first day of month(MMM/01/YYYY) except the records having date in Jan 2024 which I want to show as last day of month(01/31/2024).

[dufoq3]

Hi, last day of month you can achieve this way:

Date.EndOfMonth(#date([Year],[Month Number],1))

[Maitreya10]

I don't want the enddate for all the records, only for the records having last(latest) month and year.

[dufoq3]

For future requests, provide sample data as table so we can copy/paste (see note below my comment) and expected result based on sample data please.

Result

let
    Source = Table.FromRows(Json.Document(Binary.Decompress(Binary.FromText("i45WMjRU0lEyMjAyVorVAfKMUHgQjgmYYwTnxAIA", BinaryEncoding.Base64), Compression.Deflate)), let _t = ((type nullable text) meta [Serialized.Text = true]) in type table [Month = _t, Year = _t]),
    Ad_Date = Table.AddColumn(Source, "Date", each #date(Number.From([Year]),Number.From([Month]),1), type date),
    MaxDate = List.Max(Ad_Date[Date]),
    ReplaceMaxDate = Table.TransformColumns(Ad_Date, {{"Date", each if _ = MaxDate then Date.EndOfMonth(MaxDate) else _, type date}})
in
    ReplaceMaxDate

[Maitreya10]

Thanks

[dufoq3]

You're welcome. If my solution works, Accept is as Solution please. Thanks.

[smpa01]

@DSwezey  create a new column as 

#date([Year],[Month Number],1)

and then format as you wish through DAX

[DSwezey]

I get this error when adding the custom column. 

[ronrsnfld]

date <> #date

change 

date([Year],[Month Number],1)

to (as written by @smpa01 )

#date([Year],[Month Number],1)