Dan here - I created timezone the open source project and am now working on a product version at timezone.io. Didn't know people would stumble upon it yet so I just pushed the new homepage - Hope that helps paint a picture for whats to come!
How, exactly? This may be keeping track of someone else's team, but not my team, nor can I see any method of "using" it.
There was an earlier post. You need to clone the code and deploy it yourself on heroku.