Converting using almost any style will cause the datetime2 value to be converted to UTC.
Also, conversion from datetime2 to datetimeoffset simply sets the offset at +00:00
, per the below, so it is a quick way to convert from Datetimeoffset(offset!=0)
to Datetimeoffset(+00:00)
declare @createdon datetimeoffset
set @createdon = '2008-12-19 17:30:09.1234567 +11:00'
select CONVERT(datetime2, @createdon, 1)
--Output: 2008-12-19 06:30:09.12
select convert(datetimeoffset,CONVERT(datetime2, @createdon, 1))
--Output: 2008-12-19 06:30:09.1234567 +00:00