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If you're looking to code your own utilities, you will need a source that provides the Dow's opening price for any given day. Details on such services are available at Dow Jones Industrial Average.

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Ruby Geohasher v1.1

ScottKuma did this as a first excursion into Ruby. Yes, it's long. Yes, it's kinda clunky. However, IT WORKS!

Any changes, suggestions, etc. are happily accepted!

#!/usr/bin/ruby
#geohasher.rb

# Can be run without any command-line arguments (and gets the current geohash for the graticule specified in myLat and myLong, below),
# a single argument (the date in YYYY-MM-DD or YYYY/MM/DD format), 
# two arguments (the latitude & longitude "base" coordinates), 
# or three arguments (latitude & longitude "base" coordinates, followed by the date),
# or four arguments:  (latitude & longitude "base" coordinates, the date, then the desired opening #),

require 'net/http'

myLat = "39"	# Change me to set the desired default graticule's latitude
myLong = "-84"	# Change me to set the desired default graticule's longitude

def hexFracToDecFrac(hexFracPart)
	#I wish I had a neat little algorithm to do this in one line - but this works!
	#NOTE:  do not feed the preceding "0." to this function....only the fractional part (the part after the decimal point)
	fracLen = hexFracPart.length
	fracPortion = hexFracPart[0..(fracLen-1)]
	fracLen = fracPortion.length
	myLen = (fracLen - 1)
	sum = 0	
	for i in (0 .. myLen)
		numSixteenths = fracPortion[i..i].to_i(16)
		conversionFactor = (16.**(i+1)).to_f
		conversionFactor = 1./conversionFactor
		sum = sum + ((numSixteenths) * conversionFactor)
	end
	return sum.to_s[2..8]
end

t=Time.now
myDate = t.strftime("%Y-%m-%d")
dow = ""

if ARGV.length == 1
	myDate = ARGV[0]
end

if ARGV.length == 2
	myLat = ARGV[0]
	myLong = ARGV[1]
end
	
if ARGV.length == 3
	myLat = ARGV[0]
	myLong = ARGV[1]
	myDate = ARGV[2]
end

if ARGV.length == 4
	myLat = ARGV[0]
	myLong = ARGV[1]
	myDate = ARGV[2]
	dow = ARGV[3]
end

dateSplit = ''
if myDate.split('/').length == 3
	dateSplit = myDate.split('/')
else
	dateSplit = myDate.split('-')
end

myDate = Date.civil(dateSplit[0].to_i, dateSplit[1].to_i, dateSplit[2].to_i)

#fix for the "-30 rule"
fixDate = Date.civil(2008,05,25)
timeDelta = 0
if myLong.to_i > -30 and (myDate > fixDate)
	puts "-30 rule in effect!"
	timeDelta = 1
end

algorithmEncodedDate = myDate.to_s
urlEncodedDate = (myDate - timeDelta).strftime('%Y/%m/%d')

baseURL = 'irc.peeron.com'
basePath = '/xkcd/map/data/'
fullPath = basePath + urlEncodedDate
if dow==""
  Net::HTTP.start(baseURL,80) do |http|
    dow = http.get(fullPath).body
  end
end

if !dow.include? "404 Not Found"
	ghash = algorithmEncodedDate+'-'+dow
	digest = Digest::MD5.hexdigest(ghash)
	digest1 = digest[0..15]
	digest2 = digest[16..31]
	puts "(" + myLat + "." + hexFracToDecFrac(digest1) + ", " + myLong + "." + hexFracToDecFrac(digest2) + ")"
else 
	puts "Dow information not available for "+urlEncodedDate
end

Here's one way you could do hex to dec fraction in one line - it's "little", I'm not so sure about "neat"

def hexFracToDecFrac hexFracPart
  hexFracPart.split('').inject((cf=1)-1){|sum,c|sum+ c.to_i(16)/(cf<<=4).to_f}.to_s[2..8]
end

macHasher

macHasher screenshot

Scottkuma worked feverishly to:

learn Apple OSX Programming and...
put together a geohash calculator for the Mac.

Installation:

It's a normal mac application - drag it to your Applications folder, OR just run it from inside the DMG. I think I compiled it as a Universal Binary. If you can't run it on a particular system and/or version of OSX, please let me know.

Usage:

Start by entering your graticule's Lat/Long numbers. The given numbers are for Cincinnati, Ohio.

For today's graticule, just click "Generate!" For dates in the past (or the near-future, for Saturday & Sunday graticules), select the date on the calendar, then click "Generate!"

Known bugs:

Requires a valid network connection; locks pretty good when one doesn't exist.
does not calculate east of -30 correctly for dates prior to 5/27/2008
window doesn't lock its size like I thought it would...

Planned enhancements:

will allow for saving of a known "home" location
will calculate distance & bearing to a known location
will calculate same for adjacent graticules to find a closer geohash

Geohash for the iPhone

Geohash screenshot

Geohash for the iPhone is available here in the app store (for free).

The new version of Geohash now supports looking forward over the weekend. Yay!

Next feature up? The most requested feature by far is the ability to view Geohash locations in surrounding graticules. I'm working on it, trust me. :) Unfortunately, I'm off to vacation in Spain in a couple days, so I probably won't have it done until I get back in September. Sorry! I may try to release an interim version which lets you modify your graticule in a kludgy fashion. It'll work, but won't be up to the full vision I have for this feature.

I'll also be publishing the source code when I get a chance. (Update: I'm still a little unsure about the implications of Apple's NDA on their SDK. I'm trying to determine if releasing the source violates the NDA or not. It'll be out for sure once I make sure I won't get spanked by Apple!)

Thanks to Scottkuma for a spot of help with the MD5 hash conversion.

PS. Obviously, feel free to leave reviews on the app store telling everyone what you think, good and bad, but also send feedback to me (casey@kckd.org), so I can respond directly!