Trading day

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In business, the trading day is the time span that a particular stock exchange is open. For example, the New York Stock Exchange is, as of 2014, open from 9:30 AM Eastern Time to 4:00 PM Eastern Time. Trading days are usually Monday to Friday. When a trading day ends, all share trading ends and is frozen in time until the next trading day begins. There are several other special circumstances which would lead to a shortened trading day, or no trading day at all, such as on holidays.

There are about 252 trading days in a year. This is from 365.25(days on average per year) * 5/7(proportion work days per week) = 260.89 - 9(holidays*) = 251.89 ~ 252. *New Year's Day, Martin Luther King Jr. Day, Washington's Birthday, Good Friday, Memorial Day, Independence Day, Labor Day, Thanksgiving Day, Christmas Day.[1]

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