SQL Dynamic DatePart when using DateDiff

Question

Is there a way to pass the DatePart parameter of DateDiff as a variable? So that I can write code that is similar to this?

DECLARE @datePart VARCHAR(2)
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Answer 1

I don't think there are better ways then you describe. Sql Server probably compiles the DATEDIFF query to a set of operations that depend on the datepart parameter. So you'd need a CASE, or dynamic queries.