Getting offset of datetimeoffset in SQL Server

问题

In SQL Server I need to find the offset of a given datetimeoffset(7).

I have researched the documentation and there are all ways to change the offset but not a way to know the offset of a particular value (sorry if I missed it).

Well I came up with the following piece of code that I find too complicated although seems to work.

DECLARE @datetimeOffset datetimeoffset(7)

SET @datetimeOffset = CAST('2007-05-08 22:35:29.1234567-05:00' AS datetimeoffset(7))

DECLARE @result datetimeoffset(7)
DECLARE @offsetMin int

SET @offsetMin = DATEDIFF(mi, cast(SWITCHOFFSET(@datetimeOffset, '+00:00') as datetime), cast(@datetimeOffset as datetime)) 

SELECT @offsetMin

I still have to do the conversion to the +00:00 format but wanted to check if there is a better way of doing this.

Thanks!