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The Epoch in C is the number of seconds that have elapsed since 1st January 1970. Most databases use something similar (a few of them back to 1/1/99, being 1899).
It's convenient (small), Y2K compatible and makes date/time maths a lot easier.
It'll be good until about the year 2069 or something last time I calculated ;-)
It's known as "t_time" in C, and I have a feeling it's called the same in php?
Google are probably using it as a means of checking dates referenced by something other than 1/1/1970.
TJ