Issue with List.Max ([Date]) in power query

[GGG123]

This formula

   Date.From(List.Max(Table.Column(#"Reordered Columns", [Date]))) - Date.From([Date])

is returning this error Expression.

   Error:

   We cannot convert the value #date(2024, 1, 15) to type Text.
   Details:
   Value=15/01/2024
   Type=[Type]

The column Date in power query is Type--> Date

I'm trying to get the latest date from the column Date and return for each date in the column the difference between the latest date and the date in each row.

How do I make this work?

[GGG123]

Now I'm getting this error:

   DataFormat.Error: We couldn't parse the input provided as a Dat

It's so weird because until last month I never had problems with this Power Query model. 

Also, when I use the formula List.Max to find the latest date on a different paper, it works fine. 

I tried to changed the Date as Locale and play around a bit but still the same error.

[ManuelBolz]

Hello @ ,

If my post helped you, please give me a 👍kudos and mark this post with Accept as Solution.

Do you perhaps have a screenshot of your data table or an excerpt of the data or the M-Code? It looks like your column is not correctly defined as a Date data type. In the following screenshot I have added my solution to some test data.

Best regards from Germany
Manuel Bolz

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[GGG123]

Thnaks for all your answers. However, I ve tried that too and the data seems fine. 

See below:

I also tried to look for the 'Undeposited Items' mentioned in the Error but the column seems to be having only dates, as it should.

[ManuelBolz]

Hello @GGG123,

If my post helped you, please give me a 👍kudos and mark this post with Accept as Solution.

Here is my slightly adapted code. I hope this helps. Here you have to adapt the "Source" step to your code again.

let
    Source = Table.FromRows(Json.Document(Binary.Decompress(Binary.FromText("dc1LDsAgCEXRvTA2kY+KezHufxuFkjY2KZM3ObmwFlCvSJWRGxQgVVsW2OVfWir9FpZTpvhKKtEYtAdYyHZyvNGK/ZXBnmAkeIp6QxmMAPqA39IM2J7sCw==", BinaryEncoding.Base64), Compression.Deflate)), let _t = ((type nullable text) meta [Serialized.Text = true]) in type table [Date = _t, Page = _t, Line = _t]),
    Type = Table.TransformColumnTypes(Source,{{"Date", type date}}),

    LatestDate = List.Max(Table.Column(Type, "Date")),
    AddedDateDifference = Table.AddColumn(Type, "Date Difference", each Duration.Days(LatestDate - [Date]), Int64.Type)
in
    AddedDateDifference

Best regards from Germany
Manuel Bolz

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[GGG123 · Accepted solution]

I finally worked it out. All I did is to go at the beginning of the code and Filtered Out "Undeposited Items" which was mentioned in the error I was getting 'DataFormat.Error: We couldn't parse the input provided as a Date'.

The thing that I couldnt understand is that when looking at the Column Profile, everything showed 0 Error and the count seemed to be all in order. 

Thanks for your help anyway!

[GGG123]

Im not sure how to fit your code into mine.

Here's mine.

let
Source = Excel.Workbook(File.Contents("\\accnzrep01\B2B\Bank\Bank Reconciliation Report\Bank Reconciliation Report Data Export (Month End).xls"), null, true),
Sheet2 = Source{[Name="Sheet1"]}[Data],
#"Removed Top Rows" = Table.Skip(Sheet2,4),
#"Added Conditional Column" = Table.AddColumn(#"Removed Top Rows", "Txn Type", each if [Column1] = "Unreconciled Statement Items" then "Unreconciled Statement Items" else if [Column1] = "Unreconciled GL Items" then "Unreconciled GL Items" else null),
#"Added Conditional Column1" = Table.AddColumn(#"Added Conditional Column", "GL String", each if [Column1] = "Code:" then [Column2] else null),
#"Filled Down" = Table.FillDown(#"Added Conditional Column1",{"Txn Type", "GL String"}),
#"Filtered Rows" = Table.SelectRows(#"Filled Down", each [Column1] <> null and [Column1] <> "Date" and [Column1] <> "Code:" and [Column1] <> "Unreconciled Statement Items" and [Column1] <> "Unreconciled GL Items" and [Column1] <> "BankRecRep.rpt"),
#"Renamed Columns" = Table.RenameColumns(#"Filtered Rows",{{"Column3", "Page"}, {"Column6", "Line"}, {"Column10", "Type"}}),
#"Changed Type" = Table.TransformColumnTypes(#"Renamed Columns",{{"Column1", type date}}),
#"Renamed Columns1" = Table.RenameColumns(#"Changed Type",{{"Column1", "Date"}, {"Column12", "Reference"}, {"Column15", "Details"}}),
#"Changed Type1" = Table.TransformColumnTypes(#"Renamed Columns1",{{"Column23", Currency.Type}}),
#"Removed Other Columns" = Table.SelectColumns(#"Changed Type1",{"Date", "Page", "Line", "Type", "Reference", "Details", "Column23", "Txn Type", "GL String"}),
#"Renamed Columns2" = Table.RenameColumns(#"Removed Other Columns",{{"Column23", "Amount"}}),
#"Uppercased Text" = Table.TransformColumns(#"Renamed Columns2",{{"Reference", Text.Upper, type text}, {"Details", Text.Upper, type text}}),
#"Reordered Columns" = Table.ReorderColumns(#"Uppercased Text",{"Txn Type", "GL String", "Date", "Page", "Line", "Type", "Reference", "Details", "Amount"})
in
#"Reordered Columns"

Up until this point everything works fine. Are you able to fit your code into mine so that I only need to paste it in the advanced editor? 

Thanks!

[ManuelBolz]

Hello @GGG123  ,

If my post helped you, please give me a 👍kudos and mark this post with Accept as Solution.

Try this solution.

let
    #"Reordered Columns" = YOURCODE
    LatestDate = List.Max(Table.Column(#"Reordered Columns", "Date")),
    AddedDateDifference = Table.AddColumn(Source, "Date Difference", each Duration.Days(LatestDate - [Date]), Int64.Type)
in
    AddedDateDifference

Best regards from Germany
Manuel Bolz

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[Joe_Barry]

Hi @GGG123 

This video will help you create the MaxDate in a new column. https://www.youtube.com/watch?v=hidJ5T_DYQ0

You can then create a custom column

[NewColumn] - [Date]

 this will return a duration value

Hope this helps