Expanding Dates List to Have Months Start Only

[Anonymous]

Hi Guys,

I seek your support please.

I have 2 DateTime columns in my query, they are labelled as: 1) "From" and 2) "To"

What I need to do is to create a list which by expanding, I get new column that has the involved months starts.

For instance, in case I have entry in "From" Column that got the value: 12/7/2020 12:00:00 Am and entry in "To" Column that got the value: 3/15/2021 12:00:00 AM, so the custom column created from the list should have the entries:

12/1/2020

1/1/2021

2/1/2021

3/1/2021

How could I do that?

I have a script that could expand for me a custom column by with interval of 1 day each, it is as follows:

List.Dates(DateTime.Date([From]),Duration.Days(DateTime.Date([To])- DateTime.Date([From]))+1,Duration.From(1))

[jennratten · Accepted solution]

Here you go.  🙂

let
    Source = Table.FromRows(Json.Document(Binary.Decompress(Binary.FromText("i45WMjTSN9c3MjAyUDA0sjIwACIFx1wlHSVjfUNTkLghkrivUmwsAA==", BinaryEncoding.Base64), Compression.Deflate)), let _t = ((type nullable text) meta [Serialized.Text = true]) in type table [From = _t, To = _t]),
    #"Changed Type" = Table.TransformColumnTypes(Source,{{"From", type datetime}, {"To", type datetime}}),
    #"Added Custom" = Table.AddColumn(#"Changed Type", "ListDates", each List.Distinct(List.Transform ( List.Dates(DateTime.Date([From]),Duration.Days(DateTime.Date([To])- DateTime.Date([From]))+1,Duration.From(1)), each Date.StartOfMonth(_))))
in
    #"Added Custom"