I am using gmt.. in the currency market, most money is exchanged during the time the London market is open. It captures late Asia and early U.S. markets. A snapshot of the world. I Trade a lot depending on closes. I may not have the optimal time. I do not give anyone else that honor either. I am a watcher,, atm this is early in my schooling. Until I find better. I stick with gmt. For instance today, after closing under it. Bitcoin dropped further. That isn't conclusive on its own. Over time, its noteworthy.