I'd assume the correct thing to do is a vector clock, where each blocks time stamp is nothing more than a offset from the previous blocks.
It's easy to get most machines in agreement with how long a second is, but it's very very hard to get all nodes in agreement to what the exact time is.
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I'm not sure how that solves anything, since UTC would have the same issues as a UNIX timestamp.
I'd assume the correct thing to do is a vector clock, where each blocks time stamp is nothing more than a offset from the previous blocks.
It's easy to get most machines in agreement with how long a second is, but it's very very hard to get all nodes in agreement to what the exact time is.
So skip it entirely.