下面是一个将夏令时考虑在内的更简单的例子

CREATE FUNCTION [dbo].[UtcToLocal] 
(
    @p_utcDatetime DATETIME 
)
RETURNS DATETIME
AS
BEGIN
    RETURN DATEADD(MINUTE, DATEDIFF(MINUTE, GETUTCDATE(), @p_utcDatetime), GETDATE())
END

最简单的答案并不总是在底部，但这一次是，并且可以在上面的评论中看到。 使用您自己的“AT TIME ZONE”来捕获列/数据字段的TzOffset，而不是当前的SYSDATETIME。 在下面的数据中，2个查询，一个关于feb数据(DST是关闭的，在阿姆斯特丹的冬天)+1差异 第二次查询阿姆斯特丹4月份的数据，所以+2小时的差异。

    select top 2 month(receiveTimeUTC) as MonthInWinterOrSpring
   ,  receiveTimeUTC
   ,  CONVERT(datetime,  SWITCHOFFSET(CONVERT(datetimeoffset,  receiveTimeUTC),  DATENAME(TzOffset, SYSDATETIMEOFFSET()))) as LocalTimeWrongNoDST
   ,  CONVERT(datetime,  SWITCHOFFSET(CONVERT(datetimeoffset,  receiveTimeUTC),  DATENAME(TzOffset, receiveTimeUTC  AT TIME ZONE 'Central European Standard Time' ))) as LocalTimeWithDST
       from sensordetails order by id

    select top 2 month(receiveTimeUTC) as MonthInWinterOrSpring, receiveTimeUTC
,  CONVERT(datetime,  SWITCHOFFSET(CONVERT(datetimeoffset,  receiveTimeUTC),  DATENAME(TzOffset, SYSDATETIMEOFFSET()))) as LocalTimeWrongNoDST
,  CONVERT(datetime,  SWITCHOFFSET(CONVERT(datetimeoffset,  receiveTimeUTC),  DATENAME(TzOffset, receiveTimeUTC  AT TIME ZONE 'Central European Standard Time' ))) as LocalTimeWithDST
       from sensordetails order by id desc

结果:

所以这是一个T-SQL (SQL Server Answer)，不需要函数的storedproc。

罗恩的回答有一个错误。它使用当地时间凌晨2:00，其中需要UTC等效值。我没有足够的声望分数来评论Ron的回答，所以更正版本如下:

-- =============================================
-- Author:      Ron Smith
-- Create date: 2013-10-23
-- Description: Converts UTC to DST
--              based on passed Standard offset
-- =============================================
CREATE FUNCTION [dbo].[fn_UTC_to_DST]
(
    @UTC datetime,
    @StandardOffset int
)
RETURNS datetime
AS
BEGIN

declare 
    @DST datetime,
    @SSM datetime, -- Second Sunday in March
    @FSN datetime  -- First Sunday in November
-- get DST Range
set @SSM = datename(year,@UTC) + '0314' 
set @SSM = dateadd(hour,2 - @StandardOffset,dateadd(day,datepart(dw,@SSM)*-1+1,@SSM))
set @FSN = datename(year,@UTC) + '1107'
set @FSN = dateadd(second,-1,dateadd(hour,2 - (@StandardOffset + 1),dateadd(day,datepart(dw,@FSN)*-1+1,@FSN)))

-- add an hour to @StandardOffset if @UTC is in DST range
if @UTC between @SSM and @FSN
    set @StandardOffset = @StandardOffset + 1

-- convert to DST
set @DST = dateadd(hour,@StandardOffset,@UTC)

-- return converted datetime
return @DST

END

第一个功能:配置为意大利时区(+1，+2)，切换日期:3月和10月的最后一个星期天，返回当前时区与datetime的差值作为参数。

Returns:
current timezone < parameter timezone ==> +1
current timezone > parameter timezone ==> -1
else 0

代码是:

CREATE FUNCTION [dbo].[UF_ADJUST_OFFSET]
(
    @dt_utc datetime2(7)
)
RETURNS INT
AS
BEGIN


declare @month int,
        @year int,
        @current_offset int,
        @offset_since int,
        @offset int,
        @yearmonth varchar(8),
        @changeoffsetdate datetime2(7)

declare @lastweek table(giorno datetime2(7))

select @current_offset = DATEDIFF(hh, GETUTCDATE(), GETDATE())

select @month = datepart(month, @dt_utc)

if @month < 3 or @month > 10 Begin Set @offset_since = 1 Goto JMP End

if @month > 3 and @month < 10 Begin Set @offset_since = 2 Goto JMP End

--If i'm here is march or october
select @year = datepart(yyyy, @dt_utc)

if @month = 3
Begin

Set @yearmonth = cast(@year as varchar) + '-03-'

Insert Into @lastweek Values(@yearmonth + '31 03:00:00.000000'),(@yearmonth + '30 03:00:00.000000'),(@yearmonth + '29 03:00:00.000000'),(@yearmonth + '28 03:00:00.000000'),
                         (@yearmonth + '27 03:00:00.000000'),(@yearmonth + '26 03:00:00.000000'),(@yearmonth + '25 03:00:00.000000')

--Last week of march
Select @changeoffsetdate = giorno From @lastweek Where  datepart(weekday, giorno) = 1

    if @dt_utc < @changeoffsetdate 
    Begin 
        Set @offset_since = 1 
    End Else Begin
        Set @offset_since = 2
    End
End

if @month = 10
Begin

Set @yearmonth = cast(@year as varchar) + '-10-'

Insert Into @lastweek Values(@yearmonth + '31 03:00:00.000000'),(@yearmonth + '30 03:00:00.000000'),(@yearmonth + '29 03:00:00.000000'),(@yearmonth + '28 03:00:00.000000'),
                         (@yearmonth + '27 03:00:00.000000'),(@yearmonth + '26 03:00:00.000000'),(@yearmonth + '25 03:00:00.000000')

--Last week of october
Select @changeoffsetdate = giorno From @lastweek Where  datepart(weekday, giorno) = 1

    if @dt_utc > @changeoffsetdate 
    Begin 
        Set @offset_since = 1 
    End Else Begin
        Set @offset_since = 2
    End
End

JMP:

if @current_offset < @offset_since Begin
    Set @offset = 1
End Else if @current_offset > @offset_since Set @offset = -1 Else Set @offset = 0

Return @offset

END

然后是转换日期的函数

CREATE FUNCTION [dbo].[UF_CONVERT]
(
    @dt_utc datetime2(7)
)
RETURNS datetime
AS
BEGIN

    declare @offset int


    Select @offset = dbo.UF_ADJUST_OFFSET(@dt_utc)

    if @dt_utc >= '9999-12-31 22:59:59.9999999'
        set @dt_utc = '9999-12-31 23:59:59.9999999'
    Else
        set @dt_utc = (SELECT DATEADD(mi, DATEDIFF(mi, GETUTCDATE(), GETDATE()), @dt_utc) )

    if @offset <> 0
        Set @dt_utc = dateadd(hh, @offset, @dt_utc)

    RETURN @dt_utc

END

我没有发现任何这些示例有助于将日期时间存储为UTC到指定时区(不是服务器的时区，因为Azure SQL数据库以UTC运行)中的日期时间。我是这样处理的。它并不优雅，但它很简单，无需维护其他表就能给出正确答案:

select CONVERT(datetime, SWITCHOFFSET(dateTimeField, DATEPART(TZOFFSET, 
dateTimeField AT TIME ZONE 'Eastern Standard Time')))

如果您将数据存储为UTC日期在数据库中，您可以做一些简单的事情

select 
 [MyUtcDate] + getdate() - getutcdate()
from [dbo].[mytable]

这是从服务器的角度来看，它总是本地的，你不会笨拙地使用AT TIME ZONE '你的时区名称'， 如果您的数据库像客户端安装一样被移动到另一个时区，那么硬编码的时区可能会让您感到困扰。