A Dow holiday is a weekday on which the New York Stock Exchange (NYSE) is not open, and so no opening price for the Dow Jones Industrial Average is published. The geohashing algorithm states that in such cases, the opening price from the previous day of active trading should be used.
Official Holidays
Note that there are indeed other holidays on which the NYSE closes early; however, an opening price is still published on these days and can be used. Holidays which fall on Saturday are observed by the NYSE on the preceding Friday, and holidays which fall on Sunday are observed on the following Monday.
| Holiday | Observance |
|---|---|
| New Year's Day | 1 January* |
| Martin Luther King, Jr. Day | Third Monday in January |
| Presidents Day | Third Monday in February |
| Good Friday | Two days before Easter |
| Memorial Day | Last Monday in May |
| Independence Day | 4 July* |
| Labor Day | First Monday in September |
| Thanksgiving Day | Fourth Thursday in November |
| Christmas Day | 25 December* |
Dates in 2009
| Holiday | Date in 2009 | Use opening price from |
|---|---|---|
| New Year's Day | Thursday 1 January 2009 | Wednesday 31 December 2008 |
| Martin Luther King, Jr. Day | Monday 19 January 2009 | Friday 16 January 2009 |
| Presidents Day | Monday 16 February 2009 | Friday 13 February 2009 |
| Good Friday | Friday 10 April 2009 | Thursday 9 April 2009 |
| Memorial Day | Monday 25 May 2009 | Friday 22 May 2009 |
| Independence Day* | Friday 3 July 2009 | Thursday 2 July 2009 |
| Labor Day | Monday 7 September 2008 | Friday 4 September 2008 |
| Thanksgiving Day | Thursday 26 November 2009 | Wednesday 25 November 2009 |
| Christmas Day | Friday 25 December 2009 | Thursday 24 December 2009 |
- Note: Independence Day falls on a Saturday in 2009, and so is observed on Friday by the NYSE.
