MS SQL-时区和DST-使用错误吗？

Question

I have a piece of code like this:

Cast('2017-09-02 00:00:00' as datetime)  AT TIME ZONE 'Central Europe Standard Time' 

Output:

2017-09-02 00:00:00.000 +02:00

However, Central Europe Standard Time currently has an offset of +01:00 . So i would expect this output:

2017-09-02 00:00:00.000 +01:00

Am I using AT TIME ZONE incorrectly?

Answer 1

It converts related to the date, not when it is executed

on 2nd of September it is still DST so +02:00 is correct

if you do:

Cast('2017-12-02 00:00:00' as datetime)  AT TIME ZONE 'Central Europe Standard Time'  

it will be +01:00 as 2nd of december does not have DST