You know that moment when you want to trade but don’t know whether the exchange is open? Well, understanding the opening hours of exchanges around the world is like having a treasure map for anyone looking to take advantage of the best trading windows. The thing is, with time zones spread out everywhere, markets run almost 24 hours a day, and that changes everything in how you plan your trades.

The great part is that there are golden moments when more than one exchange is open at the same time. For example, when New York and London are trading together—around 10:30 to 13:30 in Brasília time—liquidity gets absolutely crazy. For investors coming from Brazil, the hottest period is when B3 (10:00 to 17:00 BRT) and the U.S. market (which opens at 10:30 BRT) are operating simultaneously. It’s during these exchange opening overlaps that volume spikes and things get more interesting.

Now, the annoying detail is that the U.S. and Europe use daylight saving time, so from March to November the exchange opening times shift by a few minutes for you. Meanwhile, China, India, and Saudi Arabia keep fixed time zones all year round, which makes everything more predictable. If you want to diversify globally, you need to keep an eye on these variations. The tip is: mark on your calendar when each market opens, especially those overlaps, because that’s when you can take advantage of opportunities the best and react quickly to international moves.