Correct, I guess their respective calculations would be both off by the same 
amount.

On Dec 14, 2010, at 4:34 PM, Marius Scurtescu wrote:

> On Tue, Dec 14, 2010 at 2:54 PM, Paul Walker <pjwal...@gmail.com> wrote:
>> It seems to me that expires_in suffers from the same machine time 
>> synchronization issue and additionally throws in an indeterminable time 
>> amount, while expires_at would only suffer from the former.
> 
> I don't see how expires_in suffers from same problem, it does not
> require any time synchronization. I does require a simple calculation,
> current time + expires_in, and it can be a few seconds off (the time
> since the token was issued until the client receives it and calculates
> the absolute expiration time).
> 
> Marius

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