Convert epoch data to date

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i have a epoch data : 1535525060000
i need to convert this into IST as Wednesday, August 29,2018 12:14:20 PM GMT+05:30 in sql server. How can i achieve this?

Pleasde help me on this

What I have tried:

ALTER FUNCTION [dbo].[fn_EpochToDatetime] (@Epoch BIGINT)
RETURNS DATETIME
AS
BEGIN
    DECLARE @Days AS INT, @MilliSeconds AS INT
    SET @Days = @Epoch / (1000*60*60*24)
    SET @MilliSeconds = @Epoch % (1000*60*60*24)

    RETURN (SELECT DATEADD(MILLISECOND, @MilliSeconds, DATEADD(DAY, @Days, '1/1/1970')))
END;


SELECT  [dbo].[fn_EpochToDatetime] (153552506000)

Posted 15-Nov-22 0:52am

Anil kumar Adepu

Updated 15-Nov-22 1:06am

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Richard Deeming · Answer 1 · 2022-11-15T01:06:00

The SQL datetime type does not have a "UTC offset" value.

Your code returns a UTC datetime, which is correctly set to 2018-08-29 06:44:20. If you want to convert that to a different timezone, you're going to need to use a timezone-aware type: the datetimeoffset.

SQL

CREATE OR ALTER FUNCTION dbo.fn_EpochToDateTimeOffset (@Epoch bigint)
RETURNS datetimeoffset(0)
As
BEGIN
    DECLARE @Days int, @Milliseconds int, @Utc datetimeoffset(0);
    SET @Days = @Epoch / (1000 * 60 * 60 * 24);
    SET @Milliseconds = @Epoch % (1000 * 60 * 60 * 24);
    SET @Utc = DateAdd(millisecond, @Milliseconds, DateAdd(day, @Days, '19700101'));
    Return @Utc At Time Zone 'India Standard Time';
END;
GO
SELECT dbo.fn_EpochToDateTimeOffset(153552506000);
/* 2018-08-29 12:14:20 +05:30 */

AT TIME ZONE (Transact-SQL) - SQL Server | Microsoft Learn[^]