Dow Jones Industrial Average

The Dow Jones Industrial Index is a well known indicator of the overall health of the economy calculated using the current value of a variety of stocks along with the 'Dow Divisor'. The opening Dow Jones Industrial Index is used in the Geohashing algorithm.

If you're programming a geohashing calculator, mapping service or other related service, you'll need a source for the current and historic DJI value. This page lists known sources and ways to access them and access restrictions.

Conventions

In the following descriptions, tokens will be used in URLs to represent values of the date as specified on this page on the PHP website. Specifically:

•  %Y is the four digit year (Eg, 1990)
•  %m is the two digit month number (Eg, 03)
•  %d is the two digit day number (Eg, 14)

irc.peeron.com
Date Range:	1970-01-02 - present
Update Source:	unknown
Update Frequency:	unknown
Server Location:	unknown
Contact:	Unknown

The source can be accessed at:

http://irc.peeron.com/xkcd/map/data/%Y/%m/%d

• Access Restrictions: This is used by the reference implementation. There are no technical restrictions in place, but no one has come out and stated that this is for public use yet.

xkcd.nucleardog.com
Date Range:	1970-01-02 - present
Update Source:	Google Finance
Update Frequency:	hourly
Server Location:	Texas, United States
Contact:	NuclearDog

The source can be accessed at:

http://xkcd.nucleardog.com/getdow.php?year=%Y&month=%m&day=%d

• Leading zeros are not significant in year, month and day values. If you request a date which has no value it will return the string 'null'. If you would like to avoid it returning 'null' when requesting days such as weekends, you may pass the GET variable 'compensate' with any value, which will cause it to work backwards from any non-existent days until it finds one with a value and return that instead.
• Access Restrictions: Free for anyone to use up to a reasonable volume. If you need to make tens of thousands of requests daily, feel free to contact me and I'll send you a dump of the database and the update script.