Meta Quotes data timezone & GMT offsets

 

OK, prob the most frequently asked question and one that causes the most confusion!

I believe that when we download data from the history center (meta quotes), this data is in GMT+1 & GMT+2 time with auto adjustment for daylight savings.

Is this correct and if I back test over say 10 years, finding a good 4 hour period, this 4 hour period will always be the same and not need to change with daylight savings?

Basically, do we need to take daylight savings into account when back testing? If I find good hours over 10 years on a GMT broker, I assume I can always use those fixed GMT times..