When doing DATEDIFF with datetimeoffset data, the datetimeoffset data will be converted to UTC values first, before doing the datediff operation.Here's an example:select datediff(day, cast('2010-01-01T12:34:56+13:00' as datetimeoffset(0)), cast('2010-01-01T12:34:56+08:00' as datetimeoffset(0) ) )-- Result is 1, not 0.Notice that the date values and time values are the same, but the offset is different. These translates to different days in UTC (2009-12-31 and 2010-01-01).This is inconsistent wi
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