Brazilian Summer Time (BRST) has been adopted since 1985. At the beginning it comprised the whole country, but only in 2003, after sucessive reductions, it became the system it’s known today: South, Southeast and Middle West regions have their clocks advanced in 1 hour.
Since 2008, its beginning has been on the 3rd Sunday in October and its ending, on the 3rd Sunday in February, except when it coincides with Carnival celebrations, when it is prorogued in 1 week. BRST corresponds to GMT -02:00.
Most people approve of BRST saying they have the impression the day lasts longer. In practise, it does. On the other hand, I always have the impression the day is ending and I haven’t been able to do everything I was supposed to. However, once you are spending your holidays on a nice beach, it works out just perfectly.
Mind your clocks. It will begin tonight!