UPDATE: KEP 2: Modification of datetime type: introduction of 'tz' attribute (revision 10737)

Georg C. F. Greve greve at kolabsys.com
Wed Dec 15 19:50:26 CET 2010

Hi all,

Based on plenty of feedback collected on the list, as well as through hours of 
telephone calls with Till Adam, Allen Winter and Bernhard Reiter, I've tried 
to work in all the feedback, with the most important changes being:

 * tz now an attribute, not a nested tag
 * RFC3339 parsing now optional

You can find the updated version online at the usual location:


Some background is that the people working on Kontact would find it a lot 
easier to work with attributes than nested tags.

This also being the more elegant solution, and provided that noone objected 
while some people explicitly stated this was not a problem, I think it makes 
sense to move down that path.

Also the way the Zulu format is mandated has been adjusted to match Henriks 
explicit preference, with an explicit notion that this MIGHT be changed for 
other events later.

And finally, the parsing of RFC3339 or ISO8601 has become a recommended option 
for clients to increase robustness, but is no longer mandatory. From a long 
discussion with Bernhard also followed that we'll likely propose a KEP that 
mandates client behaviour for checking the correctness of entries, and 
suggested reactions.

So expect more on that front in the future.

In the meantime, the KEP also has more rationale, some more verbose 
explanations where people suggested the rationale should be extended, and 
hopefully some useful restructuring / editing.

Please give this one a fresh read if you care about the outcome.

Best regards,

Georg C. F. Greve
Chief Executive Officer

Kolab Systems AG
Zürich, Switzerland

e: greve at kolabsys.com
t: +41 78 904 43 33
w: http://kolabsys.com

pgp: 86574ACA Georg C. F. Greve
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