Timezone handling
==================

All the timestamp type values (Area.ctime, Item.ctime, Revision.ctime)
are in UTC and stored in the database as such. In Postgresql this is
using timestamp type, and in sqlite is using a ISO string format
(without time zone).

On retrieval from database, postgresql does it automatically, and for
sqlite we do a conversion from string using
mx.DateTime.ISO.ParseDateTime(x). This ensures that the values read
are in UTC. Only in the client (cfv/cfvadmin) they are converted to
local time for display only.

This at least ensures that timestamps are consistent and their display
is chosed by the client (using its timezone); the drawback is that it
loses the original time zone.