Tuesday as start of the week

[Anonymous]

Hello all.

Need help creating a date table in Power Query. Require date column and week number but start of the week should be Tuesday. Is it possible and could you help with the M code?

[Jimmy801 · Accepted solution]

Hello @Anonymous 

this code creates a table with dates starting from beginning of 2018 for 3000 days and adds a new column with the week of the year, using tuesday as starting day

let
    Source = List.Dates(#date(2018,1,1), 3000, #duration(1,0,0,0)),
    #"Converted to Table" = Table.FromList(Source, Splitter.SplitByNothing(), null, null, ExtraValues.Error),
    #"Changed Type" = Table.TransformColumnTypes(#"Converted to Table",{{"Column1", type date}}),
    #"Renamed Columns" = Table.RenameColumns(#"Changed Type",{{"Column1", "Date"}}),
    #"Added Custom" = Table.AddColumn(#"Renamed Columns", "WeekofYear starting from Tuesday", each Date.WeekOfYear([Date], Day.Tuesday))
in
    #"Added Custom"

Copy paste this code to the advanced editor in a new blank query to see how the solution works.

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Have fun

Jimmy

[Ben1981]

Hi this is a solution to something I am working on but the output is the day number, how can I convert this into a date? So I end up with a column called week and it will group the data by weeks starting on a Tuesday.