American (New York) opens at 8:00 am to 5:00 pm EST (EDT)
Asian (Tokyo) opens at 7:00 pm to 4:00 am EST (EDT)
European (London) opens at 3:00 am to 12:00 noon EST (EDT)
The most active session is the European, then American, and the least active is the Asian. Market participants had better trade in times of high market activity, when trades on the major stock exchanges around the world take place and when there is a high probability of publication of interesting macroeconomic data - this information can be learned from the economic calendars in the websites of financial companies.
