Interesting article. It seems like a pretty good solution the problem, especially when judged on the ease of maintenance.
One thing that bothered me was, "Let’s walk through an example: let’s say it’s September 9th, 2011, at 5:00pm and our ‘epoch’ begins on January 1st, 2011. There have been 1387263000 milliseconds since the beginning of our epoch..."
The number of seconds between 5pm one day and midnight another obviously doesn't end in 3, so I looked into it. It looks like that number is taken from the epoch that is used later in the SQL which starts on Aug 24th.