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100 Years of Macintosh
Zero seconds on the Mac OS system clock is January 1, 1904. The Mac OS epoch hits 100 years ... now. That's assuming you live in the Pacific time zone, anyway: the Mac OS epoch is unique in that it is time zone-specific. Of course, none of this applies unless you are running Mac OS, and all you Mac users are using Mac OS X, right? (Geek note: the Mac OS epoch is unsigned, which is why it can count over 100 years from 0 seconds, and 32-bit Unix can't, though it can count backward to 1901.)
Mac OS epoch is unique in that it is time zone-specific.
It is unique, in the sense that it is crappy.
On Unix, the epoch is an extremely well-defined moment in time, so then is any point in time measured in epoch-seconds is also extremely well-defined.
On the Mac, the epoch-seconds depends on the time zone, meaning that in order for a measurement of time in macos-epoch-seconds to be meaningful, you also need to know the time zone. To me, that kind of ruins the whole point...