Date data changing from custom to general in a single column

osabhaois 

Try Locale option under Change  Type in Power Query

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Hello osabhaois 

check out this solution with Table.TransformColumns

let
    Source = Table.FromRows(Json.Document(Binary.Decompress(Binary.FromText("i45WMjTQNzDUNzIwMlAwMLYyNVCK1YlWUrDUNzaACBqagAVjAQ==", BinaryEncoding.Base64), Compression.Deflate)), let _t = ((type nullable text) meta [Serialized.Text = true]) in type table [Column1 = _t]),
    Transform = Table.TransformColumns
    (
        Source,
        {
            {
                "Column1",
                each DateTime.From(_,"en-US"),
                type datetime
            }
        }
    )
in
    Transform

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

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Jimmy