您必须重新格式化字符串以及转换为正确的时间。在这种情况下，我需要祖鲁时间。

Declare @Date datetime;
Declare @DateString varchar(50);
set @Date = GETDATE(); 
declare @ZuluTime datetime;

Declare @DateFrom varchar (50);
Declare @DateTo varchar (50);
set @ZuluTime = DATEADD(second, DATEDIFF(second, GETDATE(), GETUTCDATE()), @Date);
set @DateString =  FORMAT(@ZuluTime, 'yyyy-MM-ddThh:mm:ssZ', 'en-US' )  
select @DateString;

作为一个警告-如果你要使用以下(注意毫秒而不是分钟):

    SELECT DATEADD(ms, DATEDIFF(ms, GETUTCDATE(), GETDATE()), MyTable.UtcColumn) 
    AS ColumnInLocalTime
    FROM MyTable

请记住，DATEDIFF部分并不总是返回相同的数字。所以不要用它来将DateTimes精确到毫秒。

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

如果在数据库上启用CLR以及使用sql server的时区是一个选项，那么可以很容易地在. net中编写它。

public partial class UserDefinedFunctions
{
    [Microsoft.SqlServer.Server.SqlFunction]
    public static SqlDateTime fn_GetLocalFromUTC(SqlDateTime UTC)
    {
        if (UTC.IsNull)
            return UTC;

        return new SqlDateTime(UTC.Value.ToLocalTime());
    }
}

输入一个UTC日期时间值，然后输出相对于服务器的本地日期时间值。Null值返回Null。

对于任何仍然试图解决这个问题的人，这里有一个在SQL Server 2017中工作的概念证明

 declare
    @StartDate date = '2020-01-01'

;with cte_utc as
(
    select 
         1 as i
        ,CONVERT(datetime, @StartDate) AS UTC
        ,datepart(weekday, CONVERT(datetime, @StartDate)) as Weekday
        ,datepart(month, CONVERT(datetime, @StartDate)) as [Month]
        ,datepart(YEAR, CONVERT(datetime, @StartDate)) as [Year]
        
    union all

    Select
         i + 1
        ,dateadd(d, 1, utc)
        ,datepart(weekday, CONVERT(datetime, dateadd(d, 1, utc))) as Weekday
        ,datepart(month, CONVERT(datetime, dateadd(d, 1, utc))) as [Month]
        ,datepart(YEAR, CONVERT(datetime, dateadd(d, 1, utc))) as [Year]
    from    
        cte_utc
    where
        (i + 1) < 32767

), cte_utc_dates as 
(
    select 
        *,
        DENSE_RANK()OVER(PARTITION BY [Year], [Month], [Weekday] ORDER BY Utc) WeekDayIndex
    from
        cte_utc

), cte_hours as (
    select 0 as [Hour]
    union all
    select [Hour] + 1 from cte_hours where [Hour] < 23
)

select
    d.*
    , DATEADD(hour, h.Hour, d.UTC) AS UtcTime
    ,CONVERT(datetime, DATEADD(hour, h.Hour, d.UTC) AT TIME ZONE 'UTC' AT TIME ZONE 'Central Standard Time') CST
    ,CONVERT(datetime, DATEADD(hour, h.Hour, d.UTC) AT TIME ZONE 'UTC' AT TIME ZONE 'Eastern Standard Time') EST
from
    cte_utc_dates d, cte_hours h
where
    ([Month] = 3 and [Weekday] = 1 and WeekDayIndex = 2 )-- dst start
    or 
    ([Month] = 11 and [Weekday] = 1 and WeekDayIndex = 1 )-- dst end
order by
    utc
OPTION (MAXRECURSION 32767)

GO

告诉服务器保存时间的时间，'utc'，然后要求它转换为特定的时区，在这种情况下是'巴西/东部'

quiz_step_progresses.created_at  at time zone 'utc' at time zone 'Brazil/East'

使用以下选择获取时区的完整列表;

select * from pg_timezone_names;

详情请点击这里。

https://popsql.com/learn-sql/postgresql/how-to-convert-utc-to-local-time-zone-in-postgresql