declare @mydate2 datetime
 set @mydate2=Getdate()
 select @mydate2 as mydate,
 dateadd(minute, datediff(minute,getdate(),@mydate2),getutcdate())

从utc获取印度标准时间

CREATE FUNCTION dbo.getISTTime
(
@UTCDate datetime
)
RETURNS datetime
AS
BEGIN

    RETURN dateadd(minute,330,@UTCDate)

END
GO

该函数将UTC时间转换为EST时间，并进行DST调整。你可以在这个函数中更改你设计的时区名称，或者从注册表中获取:

Create Function fnConvertUTCTimetoESTTime(
    @UTCTime as datetime
)
returns datetime
as
begin
    return convert(datetime, convert(varchar(23), @UTCTime AT TIME ZONE 'UTC' AT TIME ZONE 'Eastern Standard Time', 121), 121)
end
go

select dbo.fnConvertUTCTimetoESTTime ('2020-3-8 5:00:00.000')
    , dbo.fnConvertUTCTimetoESTTime ('2020-3-8 6:00:00.000')
    , dbo.fnConvertUTCTimetoESTTime ('2020-3-8 7:00:00.000')
    , dbo.fnConvertUTCTimetoESTTime ('2020-3-8 8:00:00.000')

--returns 0:00am, 1:00am, 3:00am, 4:00am

select dbo.fnConvertUTCTimetoESTTime ('2020-11-1 4:00:00.000')
    , dbo.fnConvertUTCTimetoESTTime ('2020-11-1 5:00:00.000')
    , dbo.fnConvertUTCTimetoESTTime ('2020-11-1 6:00:00.000')
    , dbo.fnConvertUTCTimetoESTTime ('2020-11-1 7:00:00.000')

--returns 0:00am, 1:00am, 1:00am, 2:00am

请注意，您不能只是返回“@UTCTime AT TIME ZONE 'UTC' AT TIME ZONE 'Eastern Standard TIME '”作为结果，因为该结果实际上是EST格式的UTC时间(当您比较这个“假”EST时间或将其包含在order子句中时，它将被转换回UTC时间)。

我发现这个函数比使用单独的表或循环的其他解决方案更快。这只是一个基本的case语句。考虑到4月到10月之间的所有月份都有-4小时的偏移(东部时间)，我们只需要为边缘日添加更多的案例线。否则，偏移量为-5小时。

这是特定于从UTC到东部时间的转换，但可以根据需要添加其他时区功能。

USE [YourDatabaseName]
GO

/****** Object:  UserDefinedFunction [dbo].[ConvertUTCtoEastern]    Script Date: 11/2/2016 5:21:52 PM ******/
SET ANSI_NULLS ON
GO

SET QUOTED_IDENTIFIER ON
GO


CREATE FUNCTION [dbo].[ConvertUTCtoEastern]
(
@dtStartDate DATETIME
)
RETURNS DATETIME
AS
BEGIN
DECLARE @Working DATETIME
DECLARE @Returned DATETIME

SET @Working = @dtStartDate
SET @Working = 
case when month(@Working) between 4 and 10 then dateadd(HH,-4,@Working) 
     when @Working between '2017-03-12' and '2017-11-05' then dateadd(HH,-4,@Working) 
     when @Working between '2016-03-13' and '2016-11-06' then dateadd(HH,-4,@Working) 
     when @Working between '2015-03-08' and '2015-11-01' then dateadd(HH,-4,@Working) 
     when @Working between '2014-03-09' and '2014-11-02' then dateadd(HH,-4,@Working) 
     when @Working between '2013-03-10' and '2013-11-03' then dateadd(HH,-4,@Working) 
     when @Working between '2012-03-11' and '2012-11-04' then dateadd(HH,-4,@Working) 
else dateadd(HH,-5,@Working) end

SET @Returned = @Working

RETURN @Returned

END


GO

对甲骨文来说最好的方法:

硬编码的datetime:

SELECT TO_CHAR(CAST((FROM_TZ(CAST(TO_DATE('2018-10-27 21:00', 'YYYY-MM-DD HH24:MI') AS TIMESTAMP), 'UTC') AT  TIME ZONE 'EET') AS DATE), 'YYYY-MM-DD HH24:MI') UTC_TO_EET FROM DUAL

结果: 2018-10-28 00:00

列名和表名:

SELECT TO_CHAR(CAST((FROM_TZ(CAST(COLUMN_NAME AS TIMESTAMP), 'UTC') AT  TIME ZONE 'EET') AS DATE), 'YYYY-MM-DD HH24:MI') UTC_TO_EET FROM TABLE_NAME

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