TODATETIMEOFFSET (Transact-SQL)

expression

Is an expression that resolves to a datetime2 value.

Note
The expression cannot be of type text, ntext, or image because these types cannot be implicitly converted to varchar or nvarchar.

time_zone

Is an expression that represents the time zone offset in minutes (if an integer), for example -120, or hours and minutes (if a string), for example ‘+13.00’. The range is +14 to -14 (in hours). The expression is interpreted in local time for the specified time_zone.

Note
If expression is a character string, it must be in the format {+|-}TZH:THM.

datetimeoffset . The fractional precision is the same as the datetime argument.

A. Changing the time zone offset of the current date and time

DECLARE @todaysDateTime datetime2;
SET @todaysDateTime = GETDATE();
SELECT TODATETIMEOFFSET (@todaysDateTime, '-07:00');
-- RETURNS 2007-08-30 15:51:34.7030000 -07:00

B. Changing the time zone offset in minutes

DECLARE @todaysDate datetime2;
SET @todaysDate = GETDATE();
SELECT TODATETIMEOFFSET (@todaysDate, -120);
-- RETURNS 2007-08-30 15:52:37.8770000 -02:00

C. Adding a 13-hour time zone offset

DECLARE @dateTime datetimeoffset(7)= '2007-08-28 18:00:30';
SELECT TODATETIMEOFFSET (@dateTime, '+13:00');
-- RETURNS 2007-08-28 18:00:30.0000000 +13:00

Reference