Expand a list of Dates until Today using functions in Power Query 'M'

[Jmenas]

Hi All,

I trying to transform a set of dates like the one shown in the code to a list that starts on a spüecific date and moves on until today. I need this because I need to expand the records and automatically have the dates. Otherwise, the expansion is not considering new dates. 

Table.ExpandRecordColumn(
#"Converted to Table", "Value", 
{"2017-11-01", "2017-11-02", "2017-11-03", "2017-11-04", "2017-11-05", "2017-11-06", "2017-10-02", "2017-11-08", "2017-11-09", "2017-10-14", "2017-10-15", "2017-10-16", "2017-10-17", "2017-10-10", "2017-10-11", "2017-10-12", "2017-10-13", "2017-10-18", "2017-10-19", "2017-11-19", "2017-11-18", "2017-11-17", "2017-11-16", "2017-11-15", "2017-11-14", "2017-11-13"})

I tried to create a list like this:

{Number.From(Date.FromText("2017-11-01"))..Number.From(Date.FromText("2017-12-08"))}

But I need them to be Text values so I tried to convert the list to text, also doesn't work. 

Does anyone have an idea how to do it? or if there any other way to get the data from the records directly into a table without the expand? 

Best,
J.

[Eric_Zhang · Accepted solution]

@Jmenas

You can try

let 
    Source = Table.FromRows(Json.Document(Binary.Decompress(Binary.FromText("i45WSlSK1YlWSlKKjQUA", BinaryEncoding.Base64), Compression.Deflate)), let _t = ((type text) meta [Serialized.Text = true]) in type table [Column1 = _t]),
    #"Changed Type" = Table.TransformColumnTypes(Source,{{"Column1", type text}}),
    #"Added Custom" = Table.AddColumn(#"Changed Type", "Custom", each Record.FromTable(Table.FromRows({{"2017-11-01",1} , {"2017-11-02", 2}},{"Name", "Value"}) )),
    #"Converted to Table"= Table.RenameColumns(#"Added Custom",{{"Custom", "value"}}),

    list = List.Dates(#date(2017, 11, 1), Duration.Days(Duration.From(DateTime.Date(DateTime.LocalNow())-(#date(2017, 11, 1)))), #duration(1, 0, 0, 0)), 
    ListTyped = List.Transform(list , each Date.ToText(_,"yyyy-MM-dd") ),
    lastResult = Table.ExpandRecordColumn(#"Converted to Table", "value",ListTyped  )
in
    lastResult

[Jmenas]

Hi @Eric_Zhang 

that work perfect! thanks a lot! 

[Eric_Zhang]

Glad to help. 🙂