MT tester does not provide built-in means for DST. You should add a special code in your EA to adjust bar times according to international rules of DST changing.
You may have a look at this code to get a notion (disclaimer: I did not try it myself).

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I have an EA that is trading at specific hour of the data. When backtesting I noticed that the trades are placed at the wrong time in winter. Is there a way to account for this in the strategy tester?
I'm using
if(Hour() == SpecifiedTimeInConfig)
is there a way to determine in the backtester if we have DST for this month or not?