如何在电源查询中创建日历表

Question

最早的日期是 2021 年 8 月 1 日上午 12 点，增量为 30 分钟，最大日期是 DateTime.LocalNow()？

预期输出

08/01/2021 12:00:00 AM 
08/01/2021 12:30:00 AM 
08/01/2021 01:00:00 AM

代码

    Source = List.DateTimes(#datetime(2021, 08, 01, 00, 00, 0), Duration.Days(Duration.From(DateTime.Date(DateTime.LocalNow())-(#datetime(2021, 08, 01, 00, 00, 0)))), #duration(0, 0, 30, 0)),
    #"Converted to Table" = Table.FromList(Source, Splitter.SplitByNothing(), null, null, ExtraValues.Error),

但我认为这不是正确的方法。除此之外我还是得到了这个错误

Expression.Error: We cannot apply operator - to types Date and DateTime.
Details:
    Operator=-
    Left=10/20/2021
    Right=8/1/2021 12:00:00 AM

Answer 1

在电源查询中使用以下 M 代码。 这将给出 100 个日期。您可以将步长 100 更改为所需的值。

    let
    Source = Table.FromRows(Json.Document(Binary.Decompress(Binary.FromText("i45WMjIwMtQ1sNQ1MlAwNLIyMAAipdhYAA==", BinaryEncoding.Base64), Compression.Deflate)), let _t = ((type nullable text) meta [Serialized.Text = true]) in type table [Datetime = _t]),
    #"Changed Type" = Table.TransformColumnTypes(Source,{{"Datetime", type datetime}}),
    #"Added Custom" = Table.AddColumn(#"Changed Type", "Custom", each DateTime.LocalNow()),
    #"Changed Type1" = Table.TransformColumnTypes(#"Added Custom",{{"Custom", type datetime}}),
    #"Renamed Columns" = Table.RenameColumns(#"Changed Type1",{{"Datetime", "Starttime"}, {"Custom", "Endtime"}}),
    #"Added Custom1" = Table.AddColumn(#"Renamed Columns", "Dates", each List.DateTimes([Starttime], 100, #duration(0, 0, 30, 0))),
    #"Expanded Dates1" = Table.ExpandListColumn(#"Added Custom1", "Dates")
in
    #"Expanded Dates1"