The Global Market Hours Cheat Sheet

The Concept

A trader watching one clock eventually gets surprised by another one. US equities run on a fixed 6.5-hour session tied to Eastern time. Currencies trade almost continuously across a handoff of regional sessions that pass the baton as the earth turns. Neither schedule adjusts for where the trader happens to be sitting, and daylight saving doesn't move the two together, since the US, UK, and EU each shift their own clocks on different weekends.

Liquidity isn't constant even inside a session that's technically open. It concentrates in the hours when two major markets overlap and thins out everywhere else, and a fill that looked fine on a demo account can come back at a noticeably worse price during one of the quiet stretches.

Where It Comes From

NYSE's 9:30 a.m. to 4:00 p.m. Eastern session has held since September 1985, when the exchange pushed its opening bell back a half hour from 10:00 a.m., a change made to line up more of the trading day with European markets.

Forex never had a single opening bell to move, because it never had a single exchange to move it at. The modern floating-rate currency market traces to August 1971, when the US suspended the dollar's convertibility to gold, the move known as the Nixon Shock, and to March 1973, when the Bretton Woods system of fixed exchange rates broke down for good and major currencies were left to float against each other. Trading currencies against each other turned into an over-the-counter, bank-to-bank market with no central exchange and no fixed hours, structurally different from a stock exchange from day one. The Bank for International Settlements' 2025 Triennial Survey put daily global forex turnover at $9.51 trillion, with the UK alone handling more than a third of it, which is why the stretch when London and New York are both open is consistently the busiest window of the trading day.

Futures moved toward round-the-clock trading later, and more gradually. CME launched Globex, the first electronic trading platform for financial derivatives, on June 25, 1992, starting with three currency contracts and one Treasury note contract running in the overnight hours outside the exchange's traditional pit session. Electronic volume didn't pass floor volume until 2004, but Globex is the reason a CME futures contract today can trade close to 24 hours with only a short daily maintenance break, instead of going dark the moment the pit closed for the day.