Time Zones are a Drag … Seriously

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Time Zones

Time Zones were definitely being a drag today. I got an email from one of the developers at work asking about the performance difference between 2 queries. The only difference between the 2 queries is that one of them uses the AT TIME ZONE clause that was added in SQL Server 2016. I have not played around with this particular clause, but we do store quite a bit of data in the datetimeoffset data type. In the table in the

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