SQLSERVER:长整型转为日期时间F_LocalDatetime64

长整型转为日期 

CREATE FUNCTION F_LocalDatetime64( @milliSecond bigint)
returns datetime2 
as 
begindeclare @result datetime2;declare @second bigint;declare @milli bigint;if len(@milliSecond)= 13 begin-- 以毫秒级的长整型转为 日期set @second = cast( @milliSecond/1000 as int );select @RESULT = DATEADD(second,@Second,'1970-01-01') set @milli= substring( cast(@milliSecond as nvarchar(20) ),11,3)select @result = Dateadd(millisecond, @milli, @result)end;else if len(@milliSecond)= 10 select @RESULT = DATEADD(second,@MilliSecond,'1970-01-01') return(@result);
end; -- drop  FUNCTION F_LocalDatetime ;
CREATE FUNCTION F_LocalDatetime( @Second bigint)
returns datetime2 
as 
begindeclare @result datetime2;select @RESULT = DATEADD(second,@Second  ,'1970-01-01') return(@result);
end; select convert( datetime2,17418960003, 121)-- 1741795200 :,'2025-03-13 20:00:00'
select DATEADD(second,1741795200,'1970-01-01') , DBO.F_LocalDatetime(1741795200) AS DATE_TIMEselect  dbo.F_LocalDatetime64(1741795200234) as [datetime2] 
-- 返回： '2025-03-12 16:00:00.2340000'