SQL Server select where datetimeoffset older than 1 hour

Question

I know this should be easy and I do it no probelms in mySQL and Postgresql but I'm struggling with SQL Server. I want to select rows with a datetimeoffset field that's over an hour old.

select * from table where mydatetime < getdate() - 1 hour

I've tried dateadd and datediff but can't get it right.

Answer 1

select * from table where mydatetime < dateadd(hh, -1, getdate())

Answer 2

WHERE mydatetime < DATEADD(hour, -1, SYSDATETIMEOFFSET())