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Subject: Re: [cti-stix] Timestamps - Proposal (UTC)


We essentially, but not explicitly, are. We are 99.999% using the W3C spec, with the proviso that we are specifying the upper and lower bound of decimal seconds to six digits.

> On Dec 12, 2015, at 12:16 AM, Jerome Athias <athiasjerome@gmail.com> wrote:
> 
> Could we use this profile?
> http://www.w3.org/TR/NOTE-datetime
> 
> 
> 
> 2015-12-07 18:51 GMT+03:00 Eric Burger <Eric.Burger@georgetown.edu>:
>> Like I said, works for me. If it was seven days ago, I would be more adamant
>> about not turning STIX into the Intel Capital Appreciation Program™. At this
>> juncture, just go with it.
>> 
>> On Dec 7, 2015, at 10:48 AM, Jordan, Bret <bret.jordan@BLUECOAT.COM> wrote:
>> 
>> One of the core elements of the proposal is that you MUST include the
>> timezone offset.  If this is not sufficient, or we have gone in error,
>> please speak up.
>> 
>> 
>> Thanks,
>> 
>> Bret
>> 
>> 
>> 
>> Bret Jordan CISSP
>> Director of Security Architecture and Standards | Office of the CTO
>> Blue Coat Systems
>> PGP Fingerprint: 63B4 FC53 680A 6B7D 1447  F2C0 74F8 ACAE 7415 0050
>> "Without cryptography vihv vivc ce xhrnrw, however, the only thing that can
>> not be unscrambled is an egg."
>> 
>> On Dec 7, 2015, at 08:16, Eric Burger <Eric.Burger@georgetown.edu> wrote:
>> 
>> It’s a case of balancing “perfection is the enemy of the good” and “learn
>> from other people’s mistakes.” Especially, if the mistakes were made by us.
>> 
>> In 2000, I would not expect a protocol or data format to be in anything
>> other than UTC. In 2015, I cannot imagine anything else. Note that SMTP
>> comes close - if your definition of “local time zone” is
>> “2015-12-07T10:10:53.543000-05:00”, then realize you are ALREADY in UTC.
>> 
>> Given that is the proposal agreed to, I’ll shut up. So long as the text
>> points this out. Namely, that the generator of the timestamp is responsible
>> for calculating the offset.
>> 
>> The ironic thing is I will bet 99.9% of the generators use UTC internally
>> and will convert to local time, to which someone will write code to format
>> it into ASCII, where the repository will receive the ASCII time string,
>> convert it to a time, and then apply the presented offset from UTC (-5h in
>> this example) to regenerate the original UTC.
>> 
>> I think I need to buy more Intel stock ;-)
>> 
>> On Dec 7, 2015, at 7:21 AM, Trey Darley <trey@soltra.com> wrote:
>> 
>> On 06.12.2015 08:16:45, Eric Burger wrote:
>> 
>> If the goal is to work with a standard that works everywhere in the
>> world and is immune to local, flavor of the day definitions of
>> “local time,” the *ONLY* option is UTC. The world cannot agree to a
>> single repository to lookup what local time is. The Internet
>> community has put one up on a volunteer basis, but it explicitly
>> states that it is not normative, may be wrong, and will almost
>> certainly be out of date.
>> 
>> 
>> Hi, Eric -
>> 
>> On a technical level, I agree with you 110%. But as the timestamp
>> discussion was approaching Tolstoy's "War and Peace" in terms of
>> wordcount, in the interest of achieving consensus I agreed with
>> supporting multiple timezones.
>> 
>> In your view, is the potential downside of *not* making UTC mandatory
>> *so* detrimental as to justify reopening this debate, or can we live
>> with the current consensus?
>> 
>> --
>> Cheers,
>> Trey
>> --
>> Trey Darley
>> Senior Security Engineer
>> 4DAA 0A88 34BC 27C9 FD2B  A97E D3C6 5C74 0FB7 E430
>> Soltra | An FS-ISAC & DTCC Company
>> www.soltra.com
>> --
>> "There's never enough time. Thank you for yours." --Dan Geer
>> 
>> 
>> 
>> 

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