在 Power BI 中为“上次刷新时间”视觉对象正确和自动定义东部时间

Question

我有一个已发布的仪表板，每 30 分钟刷新一次，其中我有一张卡片，当 Power BI 服务刷新仪表板时，我将“上次刷新时间”日期时间与东部时间格式放在了一起，我想避免根据每年的夏令时手动更改时间（UTC 之后）。

目前我根据下一个 M 脚本定义了这个 EST 时间计算：

let
Source = #table(type table[Date Last Refreshed=datetime],{{DateTimeZone.UtcNow()}}),
#"Changed Type" = Table.TransformColumnTypes(Source,{{"Date Last Refreshed", type datetime}}),
#"Added Custom" = Table.AddColumn(#"Changed Type", "Custom Last Refresh", each [Date Last Refreshed]+ #duration(0,-4,0,0)),
#"Removed Columns" = Table.RemoveColumns(#"Added Custom",{"Date Last Refreshed"}),
#"Renamed Columns" = Table.RenameColumns(#"Removed Columns",{{"Custom Last Refresh", "Date Last Refreshed"}})

in
#"Renamed Columns"

Answer 1

我用它来调整夏令时（我也在东方）：

let
ESTAdjustment = (InputDateTimeAsUTC as datetimezone, UTCAdjustmentAmount as number) =>
let
CurrentYear = Date.Year( DateTimeZone.SwitchZone( InputDateTimeAsUTC, UTCAdjustmentAmount ) ),
DaylightSavingsStart = Date.StartOfWeek( #datetimezone( CurrentYear, 3, 14, 0, 0, 0, UTCAdjustmentAmount, 0 ), Day.Sunday ) + #duration( 0, 2, 0, 0 ),
DaylightSavingsEnd = Date.StartOfWeek( #datetimezone( CurrentYear, 11, 7, 0, 0, 0, UTCAdjustmentAmount + 1, 0 ), Day.Sunday ) + #duration( 0, 2, 0, 0 ),
AdjustForDaylightSavingsTime = if InputDateTimeAsUTC >= DaylightSavingsStart and InputDateTimeAsUTC < DaylightSavingsEnd then UTCAdjustmentAmount + 1 else UTCAdjustmentAmount,
AdjustToEST = DateTimeZone.RemoveZone(InputDateTimeAsUTC) + #duration(0, AdjustForDaylightSavingsTime, 0, 0)
in
AdjustToEST
in
ESTAdjustment