Transforming Data by Year to 1st of each Month

[kressb]

I have data that is the same for the entire Calendar Year and comes like this:

I want to do a conversion via PowerQuery to have it like this (but for all 12 months):

I wanted to use "Expand to New Rows" but that isn't an option on the Calendar Year in Power Query.. Any ideas?

[viviank]

This is a really interesting one, and I think I have a way to do it. First, you want to add a Month column in Power Query. Add a custom column, call it Month, and set the value to 1.

To get all 12 months, we need to duplicate this table 12 times! Make a duplicate of the table 12 times, and rename each table to the months. Call one January, one February, one March and so on.

Next, go to each of the 12 tables, right-click on Month, and choose Replace Values, and replace the value of the month so that it matches the month. For example, for March, change the 1 to 3. For November, change the 1 to 11. And so on.

Now --- Append all the 12 tables (January to December) to a new table. Now you have a table with rows for each month. All that is needed now is to get the MonthYr column done.

To get the MonthYr column, add a custom column. I used this formula:

= Table.AddColumn(Source, "MonthYr", each Date.From(#datetime([CalendarYear],[Month],1,1,1,1)))

This creates a date field, which you want, using the first day of each month. The other numbers don't matter, they are hours, minutes, seconds, which don't matter for dates, but you have to put something there, so I put in 1s.

[parry2k · Accepted solution]

@kressb try following steps in PQ:

- add a column for all the months, let's call it "Month"

{1..12}

- this will create a list column, expand the list so you will have 12 rows for each line.

- add another column, let's call it "Date" and we will build this "Date" column from Year and Month and give first day of the month.

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

- and you can remove the columns you don't want and that will do it.

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[kressb]

@parry2k  perfect, thank you!