Which also doesn't provide any real value over expires_in in the web server 
flow when I think about it.

On Dec 14, 2010, at 5:40 PM, Paul Walker wrote:

> I did not consider the user-agent flow.  I guess the only truly accurate 
> response would provide both an expires_from and an expires_at?
> 
> On Dec 14, 2010, at 3:56 PM, Paul Lindner wrote:
> 
>> For User Agent flow you really really really want expires_in
>> 
>> Do you know how many PCs and browsers have their clock set incorrectly?
>> 
>> 
>> On Tue, Dec 14, 2010 at 3:23 PM, Aaron Parecki <aa...@parecki.com> wrote:
>>> Agreed. I like the idea of expires_at as well. One of the first things a
>>> client is going to do after receiving the expires_in is calculate the
>>> current time plus the offset. Makes sense to eliminate one source of timing
>>> errors.
>>> 
>>> On Dec 14, 2010 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.
>>>> 
>>>> ~pj
>>>> 
>>>> On Dec 14, 2010, at 1:35 PM, Marius Scurtescu wrote:
>>>> 
>>>>> expires_at requires very good time synchronization for all machines
>>>>> involved.
>>>>> 
>>>>> expires_in, while not very exact, is more resilient.
>>>>> 
>>>>> Marius
>>>>> 
>>>>> 
>>>>> 
>>>>> On Tue, Dec 14, 2010 at 1:24 PM, Jitesh Bhate <jbh...@exacttarget.com>
>>>>> wrote:
>>>>>> I have same question, Thanks Paul for Raising this
>>>>>> 
>>>>>> Regards
>>>>>> Jitesh
>>>>>> 
>>>>>> -----Original Message-----
>>>>>> From: oauth-boun...@ietf.org [mailto:oauth-boun...@ietf.org] On Behalf
>>>>>> Of Paul Walker
>>>>>> Sent: Tuesday, December 14, 2010 4:14 PM
>>>>>> To: OAuth WG
>>>>>> Subject: [OAUTH-WG] expires_at vs expires_in
>>>>>> 
>>>>>> Has there been discussion of using expires_at as an exact epoch time in
>>>>>> seconds as opposed to expires_in which is, at best, an approximation 
>>>>>> "from
>>>>>> the time the response was generated by the authorization server?" I
>>>>>> apologize if this has been discussed previously.
>>>>>> 
>>>>>> ~pj
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>>>> 
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>> 
>> 
>> 
>> -- 
>> Paul Lindner -- lind...@inuus.com -- linkedin.com/in/plindner
> 
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