There's a couple of things that made me think the article was way older than it actually is (and made me mildly irritated that it doesn't include the publication date).

First off, the author starts off by talking about GMT and goes on to educate the reader how UTC is actually the current standard. Maybe it's just me but I thought this would be common knowledge by now, while the author frames this as some sort of a revelation.

Then there's the jab about The IERS breaking Wikipedia's css which just doesn't seem to happen on the two devices I opened it on, so I assumed that was the case prior to Wikipedia's redesign.

Minor things for sure, and the content itself is pretty timeless (heh).