Stock markets never all trade at once. Every exchange sets its own hours, and those hours follow its local clock. That is why one market can close just as another one opens.
This guide walks through what a trading day is, why the same session looks different in each city, and how holidays change the plan. It draws on the public record of trading day rules, so every detail here has a checkable base.
What Counts as a Trading Day
The trading day, sometimes called regular trading hours, is the time span that a stock exchange is open. It is separate from electronic or extended trading hours. When a trading day ends, all trading ends. The market is frozen in time until the next trading day begins. We covered a connected angle in What does after-hours trading actually cost?.
The US Baseline: 9:30 to 4:00
The New York Stock Exchange is, as of the year 2026, open from 9:30 AM Eastern Time to 4:00 PM Eastern Time. NASDAQ uses the same 9:30 to 16:00 ET window. Trading days are usually Monday through Friday. The NYSE and NASDAQ average about 251 trading days a year. Readers following this should also see When do stock circuit breakers actually halt trading?.
Where does that number come from? Start with 365.2425 days in an average year. Take 5/7 of it for the share of work days in a week. Then subtract about 10 holidays. The result is roughly 251 trading days.
Some days are shorter. Up to three trading days, July 3, the day after Thanksgiving, and Christmas Eve, are shortened. The exchanges are open from 9:30 AM to 1:00 PM on those days. If July 3 or Christmas Eve fall on a weekend, the shortened day is simply skipped.
Holidays: Closed, Open, or Moved
The exchanges close for New Year's Day, Martin Luther King Jr. Day, Presidents' Day, Good Friday, Memorial Day, Juneteenth, Independence Day, Labor Day, Thanksgiving Day, and Christmas Day. There are also some holidays where trading is permitted, including Columbus Day, Veterans Day, and New Year's Eve.
Weekends shift things a bit. If Juneteenth, Independence Day, Christmas Day, or New Year's Day fall on a weekend, the public holiday is observed on the Friday before or the Monday after. So each holiday still costs one trading day.
Special events can change the schedule too. A state funeral of a head of state can lead to a shortened trading day, or no trading day at all. Juneteenth was declared a national holiday on June 17, 2021. It was first observed as a market holiday on June 20, 2022.
The Same Session, Different Clocks
Each stock exchange has opening hours that are based on specific time zones. People can trade in these exchanges remotely using electronic trading platforms. For those trading in different parts of the world, there are unique trading days based on the hours tied to any given time zone.
Take NASDAQ, which is open 9:30 to 16:00 ET. Anyone outside of the Eastern Time Zone gets a different trading day. In Vancouver, a trading day would run from 6:30 to 13:00. During the part of the year when North America is on standard time, it would be 17:30 to 24:00 in Moscow, and in Shanghai it would be 22:30 to 5:00. Remote traders should find their trading hours based on the stock exchange's hours and time zone.
Conclusion: Anchor to One Clock
Market hours look complex only until you fix one anchor. Pick the exchange and its home time zone, then convert. The US session is 9:30 to 4:00 Eastern, Monday to Friday, with a few holiday breaks. Everything else is that same window seen from another city.
This article is general information, not investment advice. Markets involve risk, including possible loss of principal.
