SWITCHOFFSET (Transact-SQL)

DATETIMEOFFSET

Is an expression that can be resolved to a datetimeoffset(n) value.

time_zone

Is a character string in the format [+|-]TZH:TZM or a signed integer (of minutes) that represents the time zone offset, and is assumed to be daylight-saving aware and adjusted.

datetimeoffset with the fractional precision of the DATETIMEOFFSET argument.

Use SWITCHOFFSET to select a datetimeoffset value into a time zone offset that is different from the time zone offset that was originally stored. SWITCHOFFSET does not update the stored time_zone value.

SWITCHOFFSET can be used to update a datetimeoffset column.

The following example uses SWITCHOFFSET to display a different time zone offset than the value stored in the database.

CREATE TABLE dbo.test 
    (
    ColDatetimeoffset datetimeoffset
    );
GO
INSERT INTO dbo.test 
VALUES ('1998-09-20 7:45:50.71345 -5:00');
GO
SELECT SWITCHOFFSET (ColDatetimeoffset, '-08:00') 
FROM dbo.test;
GO
--Returns: 1998-09-20 04:45:50.7134500 -08:00
SELECT ColDatetimeoffset
FROM dbo.test;
--Returns: 1998-09-20 07:45:50.7134500 -05:00

Reference