UPDATE: KEP 2: Modification of datetime: store local time, add 'tz' attribute (revision #10743)

Georg C. F. Greve greve at kolabsys.com
Wed Dec 22 13:20:15 CET 2010

Hi all,

Based on the discussions of the last days, KEP 2 has undergone a major rewrite 
to make the change to storage of time in *local time* instead of UTC, based on 
RFC3339 formatting.

If you do not understand why this change was necessary, and in particular if 
you would like to debate this change, please make sure you have read, 
understood and thought a while about


and the thread starting at


which contain the most important parts in the most concise form available.

The ultra short version is: UTC storage is an oversimplification of the issue 
that only works with substantial overhead and client side logic, which 
ultimately makes it more complicated than local time storage.

The complete KEP 2 draft is online at


and comments should as usual go to kolab-format at kolab.org.

As this was a major rewrite, it touched many parts of the KEP, so some proof 
reading and checking for editing artefacts would be appreciated.

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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