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KylieDog said:

The moment you connect a new PS3 to the internet (in order to sync trophies) your PS3 will be able to work out the time gap of when the trophy was earned and its relation to the internet time stamp.


...I would imagine.

That makes perfect sense.  It probably keeps a local timestamp and then calculates the difference between the local timestamp and the internet time when it synchs, which is essentially what you just said.  I'm surprised that didn't occur to me before... and more surprised that whoever coded the system before realized the need for it.