Trading Days Calculator
How many days the New York Stock Exchange was open between two dates — and exactly which days it wasn't.
160 trading days
2026-01-01 to 2026-08-21 — 233 calendar days, 66 weekend days, 7 weekday closures.
| 2026-01-01 | New Year's Day |
| 2026-01-19 | Martin Luther King Jr. Day |
| 2026-02-16 | Washington's Birthday |
| 2026-04-03 | Good Friday |
| 2026-05-25 | Memorial Day |
| 2026-06-19 | Juneteenth |
| 2026-07-03 | Independence Day |
What counts as a trading day
A trading day is a date the New York Stock Exchange held a regular session. That is not the same as a weekday: the exchange closes for around nine or ten holidays a year, and it has also closed for blizzards, hurricanes, a blackout, seven presidential funerals, the 1969 moon landing, and once for four straight months.
This calculator counts real sessions between two dates and names every closure it skipped. Most trading-day calculators subtract weekends and a hard-coded holiday list, which is fine for next quarter and wrong for anything historical.
Where the data comes from
The calendar covers 35,421 sessions from 1885-03-20 to 2026-08-21, and 1,475 weekday closures, of which 1,430 have a recorded reason. Where a reason isn't known it says so rather than guessing.
Counts are exact from June 1952 onward. Before that the NYSE traded Saturday mornings, and those sessions are not in this dataset, so earlier counts are weekday-only. The 2018–2025 counts have been checked against published figures and match on every year.
Why the number matters
- Annualising returns. The conventional 252 is an average, not a constant — recent years run from 250 to 253, and using the wrong one skews any volatility or Sharpe figure.
- Backtest alignment. If your bar count doesn't match the exchange calendar, you have either a data gap or a phantom bar. Comparing counts is the fastest way to find out which.
- Settlement and expiry. Anything counted in business days — settlement, option expiry, notice periods — runs on sessions, not weekdays.
The exchange's longest closure
The NYSE shut on 31 July 1914 as the First World War broke out, and did not reopen for regular trading until 12 December — a little over four months, and by a wide margin the longest closure in its history. The next longest is four days, after the September 11 attacks in 2001.